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Evidence 3 supports the claim that natural selection happened because there was a drought the finches with smaller beaks had to adapt to their new environment because the finches with smaller beaks died cause they couldn't open the tribulus seeds leading to starvation. Overtime due to natural selection the beaks grew/got bigger so then finch could eat the tribulus seeds.

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Evidence 1 supports the claim that natural selection happened because since there was a lack of food causing the medium ground finch population to decrease the medium ground finch then needed to go through evolution and get larger and thicker beaks to survive and to eat the tribulus seed.

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Evidence 2 supports the claim that natural selection happened because after the drought the medium ground finch population beak size grew dramatically, meaning that the medium ground finch population had evolved during and after the drought to survive. The reason they had evolved so quickly is because all the portulaca seeds had withered away causing the medium ground finch population to go through natural selection to survive in their new environment.

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graph showing population size and the month

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graph showing population size and the month

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In the summer of 1976 before the drought the medium ground finch population on Daphne Major had an average beak depth of 9.65 mm and an average length of 10.71 mm. After the drought in 1978 the medium ground finch population had an average beak depth of 10.55 mm and average beak length of 11.61 mm. (evidence is from Lab 18 handout)

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During the drought of 1976-1978 the portulaca seed went extinct. The portulaca seed went from 18 per square meter in May of 1976 before the drought to 0 per square meter in November of 1977 after the drought (evidence is from Lab 18 data sheet)

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The population of the finches on Daphne Major went from 751 to 186 in the year 1977 and in the year 1978 it went from 186 to 93 (evidence is from Lab 18 handout and graph is from Lab 18 data sheet)

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Natural selection caused the beak of medium ground finch population to increase.

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Which microevolution caused the beak of the medium ground finch population to increase on Daphne Major from 1976-1978?