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Natural Selection is the mechanism of Microevolution that caused the beak of the Medium Ground Finch population on Daphne Major to increase in Size From 1976 to 1978.

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Natural Selection is the mechanism of Microevolution that caused the beak of the Medium Ground Finch population on Daphne Major to increase in Size From 1976 to 1978.

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From 1976-1979 The portulaca plant and seeds slowly died off while the tribulus thrived

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In 1976, the average amount of Medium Ground Finches was 751. Then, a drought happened in 1977, leaving the Medium Ground Finch population at 93.

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During the drought of 1977 the medium ground finches that couldn't eat tribulus seeds died

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Evidence 1 proves our claim because in 1975-1976 there was an average of 9 Portulaca seeds per square meter. Then in 1977 there was an average of 4 seeds per square meter. Then in 1978 -1979 the seeds and plant of the Portulaca plant died off while the larger harder seeds of the Tribulus plant thrived.

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Evidence 2 proves our claim because if the Portulaca seeds died off, like Evidence 1 shows, the Medium Ground Finches with smaller beaks, were unable to eat the harder, tough seeds of the Tribulus plant. This made most of the birds die off, leaving the ones with larger beaks still alive.

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The drought of 1977, birds had very little food and resources to help them survive, besides the medium ground finch. The medium ground finch had a hard shelled beak, which helped them eat tribulus seeds, which let them live longer, while the birds who couldn’t eat tribulus seeds dies off.

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5th Hour- Task 77_ Group _Whiteboard_ CER Session  (1)