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When the beaks of the Finches were small they couldn't eat hard Tribulus plant seeds. Therefore the cause of this was Natural Selection. Natural Selection can cause the beaks of the Finches to be different from one and another.

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Finches have different types of beaks for instance Finches that have a small/thin beak would die because they couldn't eat hard Tribulus plant seeds. The population of these Finches in 1976 was 751, in 1978 the population decreased to 90 Finches. Over all the total population of Finches was 243.(on cause and effect paper)

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When the Portulaca plant population decreased the Finches population also decreased. This happened because the Finches had nothing to eat or drink causing their population to decrease. Also, Finches with bigger beaks mean that they didn't grow. Finches with tiny beaks means that they will die.

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A plant called the Portulaca (small/soft) plants population decreased to 0 in 1977. (on cause and effect paper)

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When rainfall decreased it affected many Finches because the crops needed water so the Finches needed had gone extinct. Therefore, a lot of Finches died due to dehydration making surviving Finches to mate with other species.

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A drought happened in 1977 in which rainfall decreased to 20mm. Therefore the Finches population decreased as well. (on cause and effect paper)

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Natural Selection is the mechanism of microevolution that cause the beak of the Medium Ground Finch population on Daphne Major to increase in size from 1976 to 1978.