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natural selection

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organisms best suited (more fit) for their environment will live longer and reproduce more.

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mutation

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changes in DNA that cause variation within a species

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adaptation

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inherited characteristic that increases the chance of survival because it benefits the organism

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evolution

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change in organisms over time by which modern organisms have descended from a common ancestor

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heritable

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being passed on from parents to offspring

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fitness

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a measure of how well you can survive and reproduce in your environment

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variation

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differences in physical traits among a species