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Eventually, he came up with the idea that there must be some mechanism for Biker the older I get the more I understand shirt, and the things that had the most success at producing offspring would rapidly (within a few generations) out populate the less successful, and would become the “normal” version of that animal, called the “wild type,” thought of as the typical example of that thing. Right there is the idea that a species can change from what we think of as that thing, to something else.
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He recognized that the advantages a thing might have could be small and Biker the older I get the more I understand shirt, but still provide a large advantage to producing successful offspring. The finches he used as an example in his book found an advantage through slightly different beak shapes on different islands. One island had lots of nut-producing trees, so having a thicker, shorter beak that is better at cracking nuts provides a more steady food supply, resulting in healthier adults, which leads to healthier eggs, and then healthier offspring who can also take advantage of that more abundant food supply.