From Year 1 to Year 5, the average beak size of finches increased from 8.00 millimeters to 9.75 millimeters. The fact that the island experienced Choose

explains this observation. Because of this environment, only certain plants survived. These types of plants left
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seeds. The availability of these seeds increased compared to
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seeds. Since these seeds were more available, finch populations with
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beak size had a higher survival rate and breeding success. Finches with
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beaks did not breed as successfully. The finch population adapted
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to this environmental change.