Topic: Construct an explanation based on evidence that the process of evolution primarily results from four factors: the potential for a species to increase in number, heritable genetic variation, competition for limited resources, and the proliferation of organisms better able to survive and reproduce (HS-LS4-2). Adjust the settings, then copy the prompt.
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Planning notes for this lesson
Prerequisite skills to check: Sources of genetic variation (HS-LS3-2); what a population and a species are; reading simple bar graphs and proportions.
Key vocabulary: evolution, population, heritable variation, mutation, sexual reproduction, competition, limited resources, survive and reproduce, proliferation, adaptation.
Warm-up idea: Show a short scenario: a beetle population where some beetles are green and some brown, birds that eat beetles they can see, and a limited amount of food. Ask students to predict what the population will look like in 20 generations, and to say what would have to be true for that change to happen.
Exit ticket idea: Students read a short case (for example antibiotic resistance in bacteria or beak size in finches during a drought) with a simple graph, then write an explanation that names all four factors and uses the evidence to show how each one contributed.
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