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Louisiana - Science: Life Science
Student Standards | Adopted: 2017
HS-LS1: : From Molecules to Organisms: Structures and Processes
HS-LS1-1: : Construct an explanation based on evidence for how the structure of DNA determines the structure of proteins which carry out the essential functions of life through systems of specialized cells.
![Screenshot of Building DNA](/Assets/img/blank.gif)
Building DNA
Construct a DNA molecule, examine its double-helix structure, and then go through the DNA replication process. Learn how each component fits into a DNA molecule, and see how a unique, self-replicating code can be created. 5 Minute Preview
![Screenshot of Genetic Engineering](/Assets/img/blank.gif)
Genetic Engineering
Use genetic engineering techniques to create corn plants resistant to insect pests or tolerant of herbicides. Identify useful genes from bacteria, insert the desired gene into a corn plant, and then compare the modified plant to a control plant in a lab setting. 5 Minute Preview
![Screenshot of RNA and Protein Synthesis](/Assets/img/blank.gif)
RNA and Protein Synthesis
Go through the process of synthesizing proteins through RNA transcription and translation. Learn about the many steps involved in protein synthesis including: unzipping of DNA, formation of mRNA, attaching of mRNA to the ribosome, and linking of amino acids to form a protein. 5 Minute Preview
![Screenshot of Protein Synthesis - High School](/Assets/img/blank.gif)
Protein Synthesis - High School
As a pediatrician, students learn about genes and protein synthesis to try to help a baby girl named Lucy who has an immunodeficiency disease. Video Preview
HS-LS1-2: : Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.
![Screenshot of Cell Types](/Assets/img/blank.gif)
Cell Types
Explore a wide variety of cells, from bacteria to human neurons, using a compound light microscope. Select a sample to study, then focus on the sample using the coarse and fine focus controls of the microscope. Compare the structures found in different cells, then perform tests to see if the sample is alive. 5 Minute Preview
![Screenshot of Circulatory System](/Assets/img/blank.gif)
Circulatory System
Trace the path of blood through a beating heart and the network of blood vessels that supplies blood to the body. Take blood samples from different blood vessels to observe blood cells and measure the levels of oxygen, carbon dioxide, sugar, and urea. 5 Minute Preview
![Screenshot of Digestive System](/Assets/img/blank.gif)
Digestive System
Digestion is a complex process, involving a wide variety of organs and chemicals that work together to break down food, absorb nutrients, and eliminate wastes. But have you ever wondered what would happen if some of those organs were eliminated, or if the sequence was changed? Can the digestive system be improved? Find out by designing your own digestive system with the Digestive System Gizmo. 5 Minute Preview
![Screenshot of Frog Dissection](/Assets/img/blank.gif)
Frog Dissection
Use a scalpel, forceps, and pins to dissect realistic male and female frogs. Organs can be removed and placed into organ system diagrams. Once the dissections are complete, the frog organ systems can be compared. Zooming, rotating, and panning tools are available to examine the frog from any angle. 5 Minute Preview
![Screenshot of Muscles and Bones](/Assets/img/blank.gif)
Muscles and Bones
See how muscles, bones, and connective tissue work together to allow movement. Observe how muscle contraction arises from the interactions of thin and thick filaments in muscle cells. Using what you have learned, construct an arm that can lift a weight or throw a ball. Connective tissue, muscle composition, bone length, and tendon insertion point can all be manipulated to create an arm to lift the heaviest weight or throw a ball the fastest. 5 Minute Preview
![Screenshot of Senses](/Assets/img/blank.gif)
Senses
Everything we know about the world comes through our senses: sight, hearing, touch, taste, and smell. In the Senses Gizmo, explore how stimuli are detected by specialized cells, transmitted through nerves, and processed in the brain. 5 Minute Preview
![Screenshot of Homeostasis - High School](/Assets/img/blank.gif)
Homeostasis - High School
In the role of a physician assistant, students help a young man, named Anthony, who has Type II diabetes and high blood pressure. Students must make a diagnosis and then must apply the principles of filtration and homeostasis to help Anthony. Video Preview
HS-LS1-3: : Plan and conduct an investigation to provide evidence that feedback mechanisms maintain homeostasis in living organisms.
![Screenshot of Homeostasis](/Assets/img/blank.gif)
Homeostasis
Control a simulated person running on a treadmill. Your challenge is to use clothing, exercise, and sweat to maintain a constant body temperature as air temperature goes up and down. Sweating (perspiration) can be controlled automatically by the Gizmo or, for a challenge, manually by the user. Don't forget to eat and drink! 5 Minute Preview
![Screenshot of Human Homeostasis](/Assets/img/blank.gif)
Human Homeostasis
Adjust the levels of clothing, perspiration, and exercise to maintain a stable internal temperature as the external temperature changes. Water and blood sugar levels need to be replenished regularly, and fatigue occurs with heavy exercise. Severe hypothermia, heat stroke, or dehydration can result if internal stability is not maintained. 5 Minute Preview
![Screenshot of Paramecium Homeostasis](/Assets/img/blank.gif)
Paramecium Homeostasis
Observe how a paramecium maintains stable internal conditions in a changing aquatic environment. Water moves into the organism by osmosis, and is pumped out by the contractile vacuole. The concentration of solutes in the water will determine the rate of contractions in the paramecium. 5 Minute Preview
![Screenshot of Enzymes - High School](/Assets/img/blank.gif)
Enzymes - High School
As a veterinary technician, students learn about enzymes to help a dog that has been eating normally but is losing a lot of weight. Video Preview
![Screenshot of Homeostasis - High School](/Assets/img/blank.gif)
Homeostasis - High School
In the role of a physician assistant, students help a young man, named Anthony, who has Type II diabetes and high blood pressure. Students must make a diagnosis and then must apply the principles of filtration and homeostasis to help Anthony. Video Preview
HS-LS1-4: : Use a model to illustrate the role of the cell cycle and differentiation in producing and maintaining complex organisms.
![Screenshot of Cell Division](/Assets/img/blank.gif)
Cell Division
Begin with a single cell and watch as mitosis and cell division occurs. The cells will go through the steps of interphase, prophase, metaphase, anaphase, telophase, and cytokinesis. The length of the cell cycle can be controlled, and data related to the number of cells present and their current phase can be recorded. 5 Minute Preview
![Screenshot of Embryo Development](/Assets/img/blank.gif)
Embryo Development
Explore how a fertilized cell develops into an embryo, a fetus, and eventually an adult organism. Compare embryo development in different vertebrate species and try to guess which embryo belongs to each species. Use dyes to trace the differentiation of cells during early embryo development, from the zygote to the neurula. 5 Minute Preview
![Screenshot of Meiosis](/Assets/img/blank.gif)
Meiosis
Explore how sex cells are produced by the process of meiosis. Compare meiosis in male and female germ cells, and use crossovers to increase the number of possible gamete genotypes. Using meiosis and crossovers, create "designer" fruit fly offspring with desired trait combinations. 5 Minute Preview
![Screenshot of Meowsis - High School](/Assets/img/blank.gif)
Meowsis - High School
As a geneticist in an animal hospital, students learn about genetic changes in meiosis to determine the reason why a male cat can have calico fur coloring. Video Preview
HS-LS1-5: : Use a model to illustrate how photosynthesis transforms light energy into stored chemical energy.
![Screenshot of Cell Energy Cycle](/Assets/img/blank.gif)
Cell Energy Cycle
Explore the processes of photosynthesis and respiration that occur within plant and animal cells. The cyclical nature of the two processes can be constructed visually, and the simplified photosynthesis and respiration formulae can be balanced. 5 Minute Preview
![Screenshot of Photosynthesis Lab](/Assets/img/blank.gif)
Photosynthesis Lab
Study photosynthesis in a variety of conditions. Oxygen production is used to measure the rate of photosynthesis. Light intensity, carbon dioxide levels, temperature, and wavelength of light can all be varied. Determine which conditions are ideal for photosynthesis, and understand how limiting factors affect oxygen production. 5 Minute Preview
![Screenshot of Photosynthesis - High School](/Assets/img/blank.gif)
Photosynthesis - High School
As a marine biologist students learn about photosynthesis to help scientists in Australia determine why the coral in the Great Barrier Reef is bleaching. Video Preview
HS-LS1-6: : Construct and revise an explanation based on evidence for how carbon, hydrogen, and oxygen from sugar molecules may combine with other elements to form amino acids and/or other large carbon-based molecules.
![Screenshot of Dehydration Synthesis](/Assets/img/blank.gif)
Dehydration Synthesis
Build a glucose molecule, atom-by-atom, to learn about chemical bonds and the structure of glucose. Explore the processes of dehydration synthesis and hydrolysis in carbohydrate molecules. 5 Minute Preview
HS-LS1-7: : Use a model to illustrate that cellular respiration is a chemical process whereby the bonds of food molecules and oxygen molecules are broken and the bonds in new compounds are formed, resulting in a net transfer of energy.
![Screenshot of Cell Energy Cycle](/Assets/img/blank.gif)
Cell Energy Cycle
Explore the processes of photosynthesis and respiration that occur within plant and animal cells. The cyclical nature of the two processes can be constructed visually, and the simplified photosynthesis and respiration formulae can be balanced. 5 Minute Preview
![Screenshot of Cell Respiration - High School](/Assets/img/blank.gif)
Cell Respiration - High School
As a medical toxicologist, students learn about cell respiration to save the life of a CIA agent that has been poisoned. Video Preview
HS-LS1-8: : Obtain, evaluate, and communicate information about (1) viral and bacterial reproduction and adaptation, (2) the body’s primary defenses against infection, and (3) how these features impact the design of effective treatment.
![Screenshot of Virus Lytic Cycle](/Assets/img/blank.gif)
Virus Lytic Cycle
Release a lytic virus in a group of cells and observe how cells are infected over time and eventually destroyed. Data related to the number of healthy cells, infected cells, and viruses can be recorded over time to determine the time required for the virus to mature within a cell. 5 Minute Preview
HS-LS2: : Ecosystems: Interactions, Energy, and Dynamics
HS-LS2-1: : Use mathematical and/or computational representations to support explanations of factors that affect carrying capacity, biodiversity and populations of ecosystems at different scales.
![Screenshot of Food Chain](/Assets/img/blank.gif)
Food Chain
In this ecosystem consisting of hawks, snakes, rabbits and grass, the population of each species can be studied as part of a food chain. Disease can be introduced for any species, and the number of animals can be increased or decreased at any time, just like in the real world. 5 Minute Preview
![Screenshot of Forest Ecosystem](/Assets/img/blank.gif)
Forest Ecosystem
Observe and manipulate the populations of four creatures (trees, deer, bears, and mushrooms) in a forest. Investigate the feeding relationships (food web) in the forest. Determine which creatures are producers, consumers, and decomposers. Pictographs and line graphs show changes in populations over time. 5 Minute Preview
![Screenshot of Prairie Ecosystem](/Assets/img/blank.gif)
Prairie Ecosystem
Observe the populations of grass, prairie dogs, ferrets and foxes in a prairie ecosystem. Investigate feeding relationships and determine the food chain. Bar graphs and line graphs show changes in populations over time. 5 Minute Preview
![Screenshot of Rabbit Population by Season](/Assets/img/blank.gif)
Rabbit Population by Season
Observe the population of rabbits in an environment over many years. The land available to the rabbits and weather conditions can be adjusted to investigate the effects of urban sprawl and unusual weather on wildlife populations. 5 Minute Preview
![Screenshot of Rainfall and Bird Beaks](/Assets/img/blank.gif)
Rainfall and Bird Beaks
Study the thickness of birds' beaks over a five-year period as you control the yearly rainfall on an isolated island. As the environmental conditions change, the species must adapt (a real-world consequence) to avoid extinction. 5 Minute Preview
![Screenshot of Rainfall and Bird Beaks - Metric](/Assets/img/blank.gif)
Rainfall and Bird Beaks - Metric
Study the thickness of birds' beaks over a five year period as you control the yearly rainfall on an isolated island. As the environmental conditions change, the species must adapt (a real-world consequence) to avoid extinction. 5 Minute Preview
![Screenshot of Ecosystems - High School](/Assets/img/blank.gif)
Ecosystems - High School
As a national park ranger, students must restore the ecosystem of a park back to normal. They interact with populations of many organisms including wolves, deer and bees. Students learn the importance of food chains and webs, and how human factors can impact the health of an environment. Video Preview
HS-LS2-4: : Use mathematical representations to support claims for the cycling of matter and flow of energy among organisms in an ecosystem.
![Screenshot of Food Chain](/Assets/img/blank.gif)
Food Chain
In this ecosystem consisting of hawks, snakes, rabbits and grass, the population of each species can be studied as part of a food chain. Disease can be introduced for any species, and the number of animals can be increased or decreased at any time, just like in the real world. 5 Minute Preview
![Screenshot of Forest Ecosystem](/Assets/img/blank.gif)
Forest Ecosystem
Observe and manipulate the populations of four creatures (trees, deer, bears, and mushrooms) in a forest. Investigate the feeding relationships (food web) in the forest. Determine which creatures are producers, consumers, and decomposers. Pictographs and line graphs show changes in populations over time. 5 Minute Preview
![Screenshot of Ecosystems - High School](/Assets/img/blank.gif)
Ecosystems - High School
As a national park ranger, students must restore the ecosystem of a park back to normal. They interact with populations of many organisms including wolves, deer and bees. Students learn the importance of food chains and webs, and how human factors can impact the health of an environment. Video Preview
HS-LS2-6: : Evaluate the claims, evidence and reasoning that the complex interactions in ecosystems maintain relatively consistent numbers and types of organisms in stable conditions, but changing conditions may result in a new ecosystem.
![Screenshot of Coral Reefs 1 - Abiotic Factors](/Assets/img/blank.gif)
Coral Reefs 1 - Abiotic Factors
Explore the abiotic factors that affect Caribbean coral reefs. Many factors can be manipulated in this simplified reef model, including ocean temperature and pH, storm severity, and input of excess sediments and nutrients from logging, sewage, and agriculture. Click "Advance year" to see how the reef responds to these changes. 5 Minute Preview
![Screenshot of Coral Reefs 2 - Biotic Factors](/Assets/img/blank.gif)
Coral Reefs 2 - Biotic Factors
In this followup to the Coral Reefs 1 - Abiotic Factors activity, investigate the impacts of fishing, disease, and invasive species on a model Caribbean coral reef. Many variables can be manipulated, included intensity of fishing, presence of black band and white band disease, and the presence of actual and potential invasive species. Click "Advance year" to see the impacts of these biotic changes. 5 Minute Preview
![Screenshot of Food Chain](/Assets/img/blank.gif)
Food Chain
In this ecosystem consisting of hawks, snakes, rabbits and grass, the population of each species can be studied as part of a food chain. Disease can be introduced for any species, and the number of animals can be increased or decreased at any time, just like in the real world. 5 Minute Preview
![Screenshot of Forest Ecosystem](/Assets/img/blank.gif)
Forest Ecosystem
Observe and manipulate the populations of four creatures (trees, deer, bears, and mushrooms) in a forest. Investigate the feeding relationships (food web) in the forest. Determine which creatures are producers, consumers, and decomposers. Pictographs and line graphs show changes in populations over time. 5 Minute Preview
![Screenshot of Prairie Ecosystem](/Assets/img/blank.gif)
Prairie Ecosystem
Observe the populations of grass, prairie dogs, ferrets and foxes in a prairie ecosystem. Investigate feeding relationships and determine the food chain. Bar graphs and line graphs show changes in populations over time. 5 Minute Preview
![Screenshot of Ecosystems - High School](/Assets/img/blank.gif)
Ecosystems - High School
As a national park ranger, students must restore the ecosystem of a park back to normal. They interact with populations of many organisms including wolves, deer and bees. Students learn the importance of food chains and webs, and how human factors can impact the health of an environment. Video Preview
HS-LS2-7: : Design, evaluate, and refine a solution for reducing the impacts of human activities on the environment and biodiversity.
![Screenshot of GMOs and the Environment](/Assets/img/blank.gif)
GMOs and the Environment
In this follow-up to the Genetic Engineering Gizmo, explore how farmers can maximize yield while limiting ecosystem damage using genetically modified corn. Choose the corn type to plant and the amount of herbicide and insecticide to use, then measure corn yields and monitor wildlife populations and diversity. Observe the long-term effects of pollutants on a nearby stream ecosystem. 5 Minute Preview
![Screenshot of Nitrogen Cycle - High School](/Assets/img/blank.gif)
Nitrogen Cycle - High School
An infant on a farm has blue baby syndrome. As an EPA environmental engineer, students must find the cause of the baby's illness. Using environment data, students learn the importance of the nitrogen cycle and how human factors can impact nature. Video Preview
![Screenshot of Photosynthesis - High School](/Assets/img/blank.gif)
Photosynthesis - High School
As a marine biologist students learn about photosynthesis to help scientists in Australia determine why the coral in the Great Barrier Reef is bleaching. Video Preview
HS-LS3: : Heredity: Inheritance and Variation of Traits
HS-LS3-1: : Formulate, refine, and evaluate questions to clarify relationships about the role of DNA and chromosomes in coding the instructions for characteristic traits passed from parents to offspring.
![Screenshot of Building DNA](/Assets/img/blank.gif)
Building DNA
Construct a DNA molecule, examine its double-helix structure, and then go through the DNA replication process. Learn how each component fits into a DNA molecule, and see how a unique, self-replicating code can be created. 5 Minute Preview
![Screenshot of DNA Analysis](/Assets/img/blank.gif)
DNA Analysis
Scan the DNA of frogs to produce DNA sequences. Use the DNA sequences to identify possible identical twins and to determine which sections of DNA code for skin color, eye color, and the presence or absence of spots. 5 Minute Preview
![Screenshot of Evolution: Mutation and Selection](/Assets/img/blank.gif)
Evolution: Mutation and Selection
Observe evolution in a fictional population of bugs. Set the background to any color, and see natural selection taking place. Inheritance of color occurs according to Mendel's laws and probability. Mutations occur at random, and probability of capture by predators is determined by the insect's camouflage. 5 Minute Preview
![Screenshot of Genetic Engineering](/Assets/img/blank.gif)
Genetic Engineering
Use genetic engineering techniques to create corn plants resistant to insect pests or tolerant of herbicides. Identify useful genes from bacteria, insert the desired gene into a corn plant, and then compare the modified plant to a control plant in a lab setting. 5 Minute Preview
![Screenshot of Human Karyotyping](/Assets/img/blank.gif)
Human Karyotyping
Sort and pair the images of human chromosomes obtained in a scan. Find differences in the scans of the various patients to find out specific things that can cause disease, as well as determining the sex of the person. 5 Minute Preview
![Screenshot of Meiosis](/Assets/img/blank.gif)
Meiosis
Explore how sex cells are produced by the process of meiosis. Compare meiosis in male and female germ cells, and use crossovers to increase the number of possible gamete genotypes. Using meiosis and crossovers, create "designer" fruit fly offspring with desired trait combinations. 5 Minute Preview
![Screenshot of Meowsis - High School](/Assets/img/blank.gif)
Meowsis - High School
As a geneticist in an animal hospital, students learn about genetic changes in meiosis to determine the reason why a male cat can have calico fur coloring. Video Preview
HS-LS3-2: : Make and defend a claim based on evidence that inheritable genetic variations may result from: (1) new genetic combinations through meiosis, (2) viable errors occurring during replication, and/or (3) mutations caused by environmental factors.
![Screenshot of Building DNA](/Assets/img/blank.gif)
Building DNA
Construct a DNA molecule, examine its double-helix structure, and then go through the DNA replication process. Learn how each component fits into a DNA molecule, and see how a unique, self-replicating code can be created. 5 Minute Preview
![Screenshot of Evolution: Mutation and Selection](/Assets/img/blank.gif)
Evolution: Mutation and Selection
Observe evolution in a fictional population of bugs. Set the background to any color, and see natural selection taking place. Inheritance of color occurs according to Mendel's laws and probability. Mutations occur at random, and probability of capture by predators is determined by the insect's camouflage. 5 Minute Preview
![Screenshot of Meiosis](/Assets/img/blank.gif)
Meiosis
Explore how sex cells are produced by the process of meiosis. Compare meiosis in male and female germ cells, and use crossovers to increase the number of possible gamete genotypes. Using meiosis and crossovers, create "designer" fruit fly offspring with desired trait combinations. 5 Minute Preview
![Screenshot of Meowsis - High School](/Assets/img/blank.gif)
Meowsis - High School
As a geneticist in an animal hospital, students learn about genetic changes in meiosis to determine the reason why a male cat can have calico fur coloring. Video Preview
HS-LS3-3: : Apply concepts of statistics and probability to explain the variation and distribution of expressed traits in a population.
![Screenshot of Chicken Genetics](/Assets/img/blank.gif)
Chicken Genetics
Breed "pure" chickens with known genotypes that exhibit specific feather colors, and learn how traits are passed on via codominant genes. Chickens can be stored in cages for future breeding, and the statistics of feather color are reported every time the chickens breed. Punnett squares can be used to predict results. 5 Minute Preview
![Screenshot of Fast Plants<sup>®</sup> 1 - Growth and Genetics](/Assets/img/blank.gif)
Fast Plants® 1 - Growth and Genetics
Grow Wisconsin Fast Plants® in a simulated lab environment. Explore the life cycles of these plants and how their growth is influenced by light, water, and crowding. Practice pollinating the plants using bee sticks, then observe the traits of the offspring plants. Use Punnett squares to model the inheritance of genes for stem color and leaf color for these plants. 5 Minute Preview
![Screenshot of Fast Plants<sup>®</sup> 2 - Mystery Parent](/Assets/img/blank.gif)
Fast Plants® 2 - Mystery Parent
In this follow-up to Fast Plants® 1 - Growth and Genetics, continue to explore inheritance of traits in Wisconsin Fast Plants. Infer the genotype of a "mystery P2 parent" of a set of Fast Plants based on the traits of the P1, F1, and F2 plants. Then create designer Fast Plants by selectively breeding plants with desired traits. 5 Minute Preview
![Screenshot of Hardy-Weinberg Equilibrium](/Assets/img/blank.gif)
Hardy-Weinberg Equilibrium
Set the initial percentages of three types of parrots in a population and track changes in genotype and allele frequency through several generations. Analyze population data to develop an understanding of the Hardy-Weinberg equilibrium. Determine how initial allele percentages will affect the equilibrium state of the population. 5 Minute Preview
![Screenshot of Microevolution](/Assets/img/blank.gif)
Microevolution
Observe the effect of predators on a population of parrots with three possible genotypes. The initial percentages and fitness levels of each genotype can be set. Determine how initial fitness levels affect genotype and allele frequencies through several generations. Compare scenarios in which a dominant allele is deleterious, a recessive allele is deleterious, and the heterozygous individual is fittest. 5 Minute Preview
![Screenshot of Mouse Genetics (One Trait)](/Assets/img/blank.gif)
Mouse Genetics (One Trait)
Breed "pure" mice with known genotypes that exhibit specific fur colors, and learn how traits are passed on via dominant and recessive genes. Mice can be stored in cages for future breeding, and the statistics of fur color are reported every time a pair of mice breed. Punnett squares can be used to predict results. 5 Minute Preview
![Screenshot of Mouse Genetics (Two Traits)](/Assets/img/blank.gif)
Mouse Genetics (Two Traits)
Breed "pure" mice with known genotypes that exhibit specific fur and eye colors, and learn how traits are passed on via dominant and recessive genes. Mice can be stored in cages for future breeding, and the statistics of fur and eye color are reported every time a pair of mice breed. Punnett squares can be used to predict results. 5 Minute Preview
HS-LS4: : Biological Evolution: Unity and Diversity
HS-LS4-1: : Analyze and interpret scientific information that common ancestry and biological evolution are supported by multiple lines of empirical evidence.
![Screenshot of Cladograms](/Assets/img/blank.gif)
Cladograms
Based on the similarities and differences between different organisms, create branching diagrams called cladograms to show how they are related. Use both morphological data (physical traits) and molecular data to create the simplest and most likely cladograms. Five different sets of organisms are available. 5 Minute Preview
![Screenshot of Embryo Development](/Assets/img/blank.gif)
Embryo Development
Explore how a fertilized cell develops into an embryo, a fetus, and eventually an adult organism. Compare embryo development in different vertebrate species and try to guess which embryo belongs to each species. Use dyes to trace the differentiation of cells during early embryo development, from the zygote to the neurula. 5 Minute Preview
![Screenshot of Evolution: Natural and Artificial Selection](/Assets/img/blank.gif)
Evolution: Natural and Artificial Selection
Observe evolution in a fictional population of bugs. Set the background to any color, and see natural selection taking place. Compare the processes of natural and artificial selection. Manipulate the mutation rate, and determine how mutation rate affects adaptation and evolution. 5 Minute Preview
![Screenshot of Human Evolution - Skull Analysis](/Assets/img/blank.gif)
Human Evolution - Skull Analysis
Compare the skulls of a variety of significant human ancestors, or hominids. Use available tools to measure lengths, areas, and angles of important features. Each skull can be viewed from the front, side, or from below. Additional information regarding the age, location, and discoverer of each skull can be displayed. 5 Minute Preview
![Screenshot of Natural Selection](/Assets/img/blank.gif)
Natural Selection
You are a bird hunting moths (both dark and light) that live on trees. As you capture the moths most easily visible against the tree surface, the moth populations change, illustrating the effects of natural selection. 5 Minute Preview
![Screenshot of RNA and Protein Synthesis](/Assets/img/blank.gif)
RNA and Protein Synthesis
Go through the process of synthesizing proteins through RNA transcription and translation. Learn about the many steps involved in protein synthesis including: unzipping of DNA, formation of mRNA, attaching of mRNA to the ribosome, and linking of amino acids to form a protein. 5 Minute Preview
![Screenshot of Rainfall and Bird Beaks](/Assets/img/blank.gif)
Rainfall and Bird Beaks
Study the thickness of birds' beaks over a five-year period as you control the yearly rainfall on an isolated island. As the environmental conditions change, the species must adapt (a real-world consequence) to avoid extinction. 5 Minute Preview
![Screenshot of Rainfall and Bird Beaks - Metric](/Assets/img/blank.gif)
Rainfall and Bird Beaks - Metric
Study the thickness of birds' beaks over a five year period as you control the yearly rainfall on an isolated island. As the environmental conditions change, the species must adapt (a real-world consequence) to avoid extinction. 5 Minute Preview
HS-LS4-2: : Construct an explanation based on evidence that biological diversity is influenced by (1) the potential for a species to increase in number, (2) the heritable genetic variation of individuals in a species due to mutation and sexual reproduction, (3) competition for limited resources, and (4) the proliferation of those organisms that are better able to survive and reproduce in the environment.
![Screenshot of Evolution: Mutation and Selection](/Assets/img/blank.gif)
Evolution: Mutation and Selection
Observe evolution in a fictional population of bugs. Set the background to any color, and see natural selection taking place. Inheritance of color occurs according to Mendel's laws and probability. Mutations occur at random, and probability of capture by predators is determined by the insect's camouflage. 5 Minute Preview
![Screenshot of Natural Selection](/Assets/img/blank.gif)
Natural Selection
You are a bird hunting moths (both dark and light) that live on trees. As you capture the moths most easily visible against the tree surface, the moth populations change, illustrating the effects of natural selection. 5 Minute Preview
![Screenshot of Rainfall and Bird Beaks](/Assets/img/blank.gif)
Rainfall and Bird Beaks
Study the thickness of birds' beaks over a five-year period as you control the yearly rainfall on an isolated island. As the environmental conditions change, the species must adapt (a real-world consequence) to avoid extinction. 5 Minute Preview
![Screenshot of Rainfall and Bird Beaks - Metric](/Assets/img/blank.gif)
Rainfall and Bird Beaks - Metric
Study the thickness of birds' beaks over a five year period as you control the yearly rainfall on an isolated island. As the environmental conditions change, the species must adapt (a real-world consequence) to avoid extinction. 5 Minute Preview
![Screenshot of Evolution - High School](/Assets/img/blank.gif)
Evolution - High School
Working as a CDC researcher, students investigate an outbreak of multi-drug resistant bacterial infections and determine how evolution was involved by tracing the source and cause of the outbreak. Video Preview
HS-LS4-3: : Apply concepts of statistics and probability to support explanations that populations of organisms adapt when an advantageous heritable trait increases in proportion to organisms lacking this trait.
![Screenshot of Evolution: Mutation and Selection](/Assets/img/blank.gif)
Evolution: Mutation and Selection
Observe evolution in a fictional population of bugs. Set the background to any color, and see natural selection taking place. Inheritance of color occurs according to Mendel's laws and probability. Mutations occur at random, and probability of capture by predators is determined by the insect's camouflage. 5 Minute Preview
![Screenshot of Microevolution](/Assets/img/blank.gif)
Microevolution
Observe the effect of predators on a population of parrots with three possible genotypes. The initial percentages and fitness levels of each genotype can be set. Determine how initial fitness levels affect genotype and allele frequencies through several generations. Compare scenarios in which a dominant allele is deleterious, a recessive allele is deleterious, and the heterozygous individual is fittest. 5 Minute Preview
![Screenshot of Rainfall and Bird Beaks](/Assets/img/blank.gif)
Rainfall and Bird Beaks
Study the thickness of birds' beaks over a five-year period as you control the yearly rainfall on an isolated island. As the environmental conditions change, the species must adapt (a real-world consequence) to avoid extinction. 5 Minute Preview
![Screenshot of Rainfall and Bird Beaks - Metric](/Assets/img/blank.gif)
Rainfall and Bird Beaks - Metric
Study the thickness of birds' beaks over a five year period as you control the yearly rainfall on an isolated island. As the environmental conditions change, the species must adapt (a real-world consequence) to avoid extinction. 5 Minute Preview
![Screenshot of Evolution - High School](/Assets/img/blank.gif)
Evolution - High School
Working as a CDC researcher, students investigate an outbreak of multi-drug resistant bacterial infections and determine how evolution was involved by tracing the source and cause of the outbreak. Video Preview
HS-LS4-4: : Construct an explanation based on evidence for how natural selection and other mechanisms lead to genetic changes in populations.
![Screenshot of Evolution: Mutation and Selection](/Assets/img/blank.gif)
Evolution: Mutation and Selection
Observe evolution in a fictional population of bugs. Set the background to any color, and see natural selection taking place. Inheritance of color occurs according to Mendel's laws and probability. Mutations occur at random, and probability of capture by predators is determined by the insect's camouflage. 5 Minute Preview
![Screenshot of Microevolution](/Assets/img/blank.gif)
Microevolution
Observe the effect of predators on a population of parrots with three possible genotypes. The initial percentages and fitness levels of each genotype can be set. Determine how initial fitness levels affect genotype and allele frequencies through several generations. Compare scenarios in which a dominant allele is deleterious, a recessive allele is deleterious, and the heterozygous individual is fittest. 5 Minute Preview
![Screenshot of Natural Selection](/Assets/img/blank.gif)
Natural Selection
You are a bird hunting moths (both dark and light) that live on trees. As you capture the moths most easily visible against the tree surface, the moth populations change, illustrating the effects of natural selection. 5 Minute Preview
![Screenshot of Evolution - High School](/Assets/img/blank.gif)
Evolution - High School
Working as a CDC researcher, students investigate an outbreak of multi-drug resistant bacterial infections and determine how evolution was involved by tracing the source and cause of the outbreak. Video Preview
HS-LS4-5: : Evaluate evidence supporting claims that changes in environmental conditions can affect the distribution of traits in a population causing: (1) increases in the number of individuals of some species, (2) the emergence of new species over time, and (3) the extinction of other species.
![Screenshot of Coral Reefs 1 - Abiotic Factors](/Assets/img/blank.gif)
Coral Reefs 1 - Abiotic Factors
Explore the abiotic factors that affect Caribbean coral reefs. Many factors can be manipulated in this simplified reef model, including ocean temperature and pH, storm severity, and input of excess sediments and nutrients from logging, sewage, and agriculture. Click "Advance year" to see how the reef responds to these changes. 5 Minute Preview
![Screenshot of Coral Reefs 2 - Biotic Factors](/Assets/img/blank.gif)
Coral Reefs 2 - Biotic Factors
In this followup to the Coral Reefs 1 - Abiotic Factors activity, investigate the impacts of fishing, disease, and invasive species on a model Caribbean coral reef. Many variables can be manipulated, included intensity of fishing, presence of black band and white band disease, and the presence of actual and potential invasive species. Click "Advance year" to see the impacts of these biotic changes. 5 Minute Preview
![Screenshot of Natural Selection](/Assets/img/blank.gif)
Natural Selection
You are a bird hunting moths (both dark and light) that live on trees. As you capture the moths most easily visible against the tree surface, the moth populations change, illustrating the effects of natural selection. 5 Minute Preview
![Screenshot of Rabbit Population by Season](/Assets/img/blank.gif)
Rabbit Population by Season
Observe the population of rabbits in an environment over many years. The land available to the rabbits and weather conditions can be adjusted to investigate the effects of urban sprawl and unusual weather on wildlife populations. 5 Minute Preview
![Screenshot of Rainfall and Bird Beaks - Metric](/Assets/img/blank.gif)
Rainfall and Bird Beaks - Metric
Study the thickness of birds' beaks over a five year period as you control the yearly rainfall on an isolated island. As the environmental conditions change, the species must adapt (a real-world consequence) to avoid extinction. 5 Minute Preview
![Screenshot of Evolution - High School](/Assets/img/blank.gif)
Evolution - High School
Working as a CDC researcher, students investigate an outbreak of multi-drug resistant bacterial infections and determine how evolution was involved by tracing the source and cause of the outbreak. Video Preview
Correlation last revised: 4/29/2024
About STEM Cases
Students assume the role of a scientist trying to solve a real world problem. They use scientific practices to collect and analyze data, and form and test a hypothesis as they solve the problems.
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Each STEM Case uses realtime reporting to show live student results.
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STEM Cases take between 30-90 minutes for students to complete, depending on the case.
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Student progress is automatically saved so that STEM Cases can be completed over multiple sessions.
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Multiple grade-appropriate versions, or levels, exist for each STEM Case.
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Each STEM Case level has an associated Handbook. These are interactive guides that focus on the science concepts underlying the case.
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Start teaching with 20-40 Free Gizmos. See the full list.
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