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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:common-ancestry-and-phylogeny/x230b3ff252126bb6:key-events-in-the-history-of-life/v/extinction Species become extinct because they can no longer survive and reproduce in their altered ...
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