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Natural selection caused the beak of the medium ground finch to increase in size and depth on Daphne Major from 1976 to 1978.

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The finches main food source died off because of the drought, leaving only the harder to eat seeds left.

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The finches that couldn't eat the remaining resources died off and the ones with the right beaks to eat them reproduced and thrived.

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The rainfall decreased.

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This caused a drought which killed off the finches main food source.

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The drought only left the hard seeds.

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With only the hard seeds left finches with short and weak beaks didn't have food they could eat so they died off, but the finches with strong and long beaks could eat these harder seeds; meaning they could survive.