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Which Microevolution caused the beak of the medium ground finch population to increase on daphne Major from 1976 to 1978

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The microevolution that caused the change in population and beak size on Daphne Major was natural selection

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Between the years of 1976 and 1978 There was a large drought that killed off the Portuculpa seed which was the main food source of the finch giving them no other food source other then the hard seed of the tribulus

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The small and frail beaks of the Finch were unable to crack open the seeds in able to get food from them causing their beaks to break or for them to starve

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A large portion of the finch population was killed off between the years of 1976 and 1978 due to lack of able food source

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Having only the Tribulus seed left the small beaked finches were killed off due to lack of food source but evolved finches with strong beaks were able to fit the seed in their mouths and break the seeds giving them a stable food source

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After the large decline in finch population there was a large incline in population

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The large incline in population is due to the reproduction of the evolved and able finches on the island who were able to get a steady food source from the Tribulus seeds