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Since the smaller birds had nothing to eat, most of them died.The only remaining birds that they could mate with were other big beaked birds. The bigger beaked birds were left to survive and reproduce, therefore giving the trait to their offspring.

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Because of the drought, the finches' food source was impacted. The Portulaca seed, what the finches normally ate, died out. They ate this seed because it was small and soft. The Tribulus plant produces large, hard seeds. This meant that they had to eat the Tribulus seed in order to survive. However, not all of the finches could eat this seed. The smaller beaked birds died because they couldn't eat.The bigger beaked birds were left to survive and reproduce, therefore giving the trait to their offspring.

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In 1977, there was only 20 mm of rainfall. On page 306 of the lab handout, it states "Much of the plant life on the island withered and died." The environment changed, meaning that the species will have to change in order to survive.

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Beak depth increased from 9.65 to 10.55 mm according to the finch characteristics in 1977/78

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On average, there were 0.4 Portulaca seeds per square meter and 5.08 Tribulus seeds per square meter in 1978 according to the seed type abundance chart.

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There was a drought in 1977 according to the rainfall by year chart.

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Natural Selection is the mechanism of microevolution that caused the beak size of the medium ground finch population on Daphne Major to increase in size from 1976 to 1978