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The grants proposed that natural selection was the mechanism that was the reason that caused the medium ground finches beak to increase in size

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It was because the drought in 19878 reduced the number of seeds on daphne major and the finches with the bigger beaks were able to eat the larger and harder seeds  so more of them survived causing more of them to be alive now.

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in 1976 before the drought the rainfall was 30 mm causing the plants to grow and when the drought occurred in 1978 the rainfall was 20mm.This had caused some if the plants to end, up dying then also causing the consumers (medium ground finches) to decrease in population.

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its because when a drought occurs rainfall becomes less frequent and it becomes more dry and plants need water to survive and certain characteristics of the finches causes them to need certain kinds of seeds and they cant get that if there characteristics dont allow them to.

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in 1976 the beak depth was an average of 9.6 mm and in 1978 it was an average of 10.7 mm

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this is a tribulus plant

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the reason the depth of the beak changed was because the drought caused there to be less seeds causing the finches with the smaller beaks to die off leaving more finches with the bigger deeper beaks to live and produce more.

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medium ground finch