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Darwin observed that organisms, particularly on the Galápagos Islands, exhibited variations that were adaptations to their specific environments. For instance, he noted differences in the beak shapes of finches, which corresponded to the types of food available on each island. These observations led him to conclude that species could diverge from common ancestors through the process of natural selection, where traits that enhance survival in a given environment become more common over generations. This insight was foundational to his theory of evolution.

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3w ago

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