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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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Natural Selection cause the beak of the medium ground finch population to increase on Daphne Major from 1976 to 1978.

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The drought caused the number of plants to decrease

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The small beaked finches died off because they couldn't eat the tribulus plants

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Large beak traits were more common so the average size increased

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The drought caused the number of plants to decrease. If the number of plants decreased the finches would not be able to get the nutrients that they need. The only plants that lived were the tribulus plants. the population size decreased because the small beaked finches could not eat the larger and harder seeds. If they can't get to the seed of the plat they will not be able to get the nutrients that they need. The drought caused the plant population to decrease. The porticula plant decreased to 0.The finches also have to be able to reach the seeds of the different plants on Daphne Major.  The only plant that they can eat is the Tribulus plant, the tribulus plant has hard and big seeds. The finch has to have a long and thicker beak to crack the seed to get the nutrients it needs.  When the finches created offsprings the larger beak traits were more common. If the traits were more common then the offspring would die off, allowing the finches to survive longer and create more offspring,\ that will be able to survive longer.

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Galapagos Finch Evolution — HHMI BioInteractive Video