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natural selection caused the beak of the medium ground finch population on daphne major to increase in size from 1976 to 1978?

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The amount of rainfall decreased so the plants decreased. from white board

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In a 2006 issue of Science, in 2004 and 2005 it was observed that the small beaked Medium Finch with a smaller beak had an advantage over those with big beaks. The medium Finch could more easily suck up smaller seads that were not being eating by the larger Finches. www.nature.com

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In january 1978 the portucale was decreasing while the tribulus was decreasing. from white board

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Smaller/thinner beaked finches die due to their inability to eat the only food source left-tribulus

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portulaca dies because of lack of rain. All food sources decrease.

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Natural selection the environment causes certain finches to be more successful and live. Drought in 1997. The rainfall was only 20mm.