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How would Darwin’s explanation of long necks in giraffes differ from Jean Baptiste Lamarck’s explanation of the same trait?

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According to Darwin's theory, giraffes that happened to have slightly longer necks and limbs would have a better chance of securing food and thus be able to have more offspring -- the "select" who survive. Conversely, in Lamarck's view, a structure or organ would shrink or disappear if used less or not at all.
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