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Overview: This classroom exercise introduces the concept of evolution by natural selection in a hypothesis-driven, experimental fashion, using a deck of cards. Author/Source: Evolution: Education and Outreach Grade level: 9-12 Time: 1-2 class periods Teaching tips: The standard exercise is suitable for upper-level high school (AP) and introductory biology students at the college level. Concepts: Artificial selection provides a model for natural selection. Evolution results from selection acting upon genetic variation within a population. Natural selection acts on the variation that exists in a population. Populations, not individuals, evolve. A hallmark of science is exposing ideas to testing. Rates of evolution vary. Teacher background: Artificial Selection Natural Selection

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