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My final piece of evidence proves that the small amount of rainfall that occurred, caused the drought to happen. Therefore this proves that the drought caused the population of the medium ground finches to rapidly decrease.

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This piece of evidence states that the finches with longer beaks are more likely to survive the drought than the short beaked finches. Also, this means that some finches had to adapt over time in order to survive the drought.

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When the Portulaca plant dies off it affects the finches survival and the short beaked finches die. The longer beaked finches adapt because they can eat the Tribulus plant.

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The drought had happened in 1977 because the average rainfall on the island was about 20 millimeters.

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The portulaca plant completely dies off by 1978.

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The depth and length of the beak is increased by .9 millimeters each in order to survive.

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The mechanism of microevolution that caused the beak of the medium ground finch population on Daphne Major to increase in size from 1976 to 1978 was natural selection.