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This proves that natural selection was present when the finches with bigger beaks survived. This is because finches with bigger beaks could more easily get food and water.

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Which mechanism of microevolution caused the beak of medium ground finch population in Daphne major to increase in size from 1976 to 1978?

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Which mechanism of microevolution caused the beak of medium ground finch population in Daphne major to increase in size from 1976 to 1978?

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The finches that survived on average have 1.12 (mm) bigger beak than the ones who did not survive. And 0.90 (mm) depper.

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Natural Selection made the finches with bigger beaks better suited to the environment.

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Natural Selection made the finches with bigger beaks better suited to the environment.

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When plant life when down from 18 Portulaca per square meter in May 1976 to in May 1978 only 1 per square meter.

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This proves natural selection because the finches with shorter and less dense beaks could not survive because it is harder to eat the tribulus seed and the finches with shorter beaks couldn't survive without the easier to eat seed.

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When the rain fall in 1976 was at 130 (mm) the next year in 1977 there was only 20 (mm) of rainfall

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This helps prove natural selection because finches with bigger beaks are more suited to the environment they live in that is way only 12% of the population survived.