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Biology, 09.04.2021 08:20 adrian540

Finch beak depth was measured before and after a severe drought in 1977. The averaged results are shown in Figure 1. After the drought, there were fewer seeds available for the finches to eat and the seeds that did remain were larger and harder to crack open. Researchers claim that when large, hard seeds are the predominate food source, the average beak depth of these finches tends to increase in subsequent generations.

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Finch beak depth was measured before and after a severe drought in 1977. The averaged results are sh...

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