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About this unit. Are you ready to learn the ins and outs of evolution? From how natural selection drives change to the different ways species arise and go extinct, this unit will take you on an exciting journey through the history of life on Earth. Natural selection. Imagine a green caterpillar on a brown tree trunk—oh, too late, a bird's eaten it.
Khan Academy
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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/science/ap-biology/gene-expression-... AP Biology
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