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I can claim that Natural Selection was the mechanism of microevolution that caused the beak of Medium ground finch population to increase in size from 1976 to 1978.

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My first evidence to support the claim is that in 1977 there was a drought that resulted in a yearly rainfall of 20 mm.
(Found in the Finch data table provided.)

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My second evidence is that in 1978 the Medium ground finches' beak size is longer and thicker by about 1.12 mm
(Found in the Finch data table provided.)

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My last evidence is that there are on average 0 portulaca seeds per square meter in 1978
(Found in the Finch data table provided)

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The reason evidence one proves the claim is because the drought  which had only 20 mm of rainfall the entire year forced smaller beaked finches to adapt. And then by adapting to the sheer requirements that the drought set out they were able to survive.

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My reasoning for evidence two is that after the drought the finches with about 1.12mm longer/thicker beaks from 1976 survived. The rest of the other finches with their smaller beaks however died because without the thick beak they couldn’t get the food that the rest could, meaning that the thicker beaked finches were Naturally selected and will most likely begin to reproduce

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The last reason for the last evidence is that they needed thicker beaks than the 1976 finches because the change in seed abundance, because the Portulaca seeds have become severely less in numbers per square meters and the Tribulus to be on average 5 per square meter the hard Tribulus seeds require the thick beak so their bodies were forced to adapt by the environment so that they could actually get food to live. This shows that they have been through the process of natural selection

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Which mechanism of microevolution caused the Medium ground finch population in daphne major to increase in size from 1976 to 1978