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In reality it was the drought and the tribulus seed that was actually making the finches decreased

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The scientist believed the decreasing was natural selection.

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There was drought in 1976 so then when the rainfall started to come back the beak size increased.

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The beak size was 10.7 in 1976 and then in 1978 it increased to 11.6

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Since smaller finches had smaller beaks they couldn't open the tribula seed,while the larger finches had bigger beaks they could open the tribula seed.

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The medium ground finches started dying.The larger finches started to increase.

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Natural selection is the microevolution that caused the beak of the medium ground finch to increase in size on daphne major from 1976 to 1978.