AP Biology Quiz
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NATURAL SELECTION
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Biogeographers study a lizard lineage found on three volcanic islands that formed sequentially: Island 1 (5 million years), Island 2 (3 million years), and Island 3 (1 million years). Genetic data show the Island 3 population is most similar to Island 2, and Island 2 is most similar to Island 1. No lizards occur on the mainland, and ocean distances between islands are small enough for rare rafting events. Which conclusion is best supported by the geographic ages and genetic pattern?
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