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The Beaks grew because the ground finches that had small beaks died off. This is because they could not get the tribulus seed and they could not eat the seed because of the hard shell. The other seed that the small beak ground finch ate died off during the drought. This supports natural selection because only the birds with the longer beaks survived and not the small beak birds.

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Natural selection is caused when a charistic of a animal is making it capable to survive. For example the ground finch with the wider beak makes it easy to break open the tribulus seed. So all of the birds with the smaller beaks can't break open the tribulus died off because the seed that they used to eat the portulace became very scarce.

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The seeds that the birds ate were very different. For example the tribulus a very hard seed and only able to be opened by a ground finch will a long and wide beak. The portucale was a soft seed and it was ate by and type of ground finch. The reason why the portucale died off is because during the drought it was hard to reproduce. And the birds that needed this seed would eat them faster than they could reproduce.

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The bird ate 2 kinds of seeds on this island. They were the portucala, and the tribulus. During the drought the portulaca became very scarce with its common found rate at .385 every square mile. But the tribulus was not scarce commonly found 4.929 every square mile.

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The measurement of the ground finches width of the beak also increased from 1976 which is before the drought to 1978 which is after the drought. The beaks width went from 9.649mm to 10.546mm.

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The measurement of the ground finches beak length had increased from 1976 to 1978 to help them survive the drought. These measurements included the length growing from 10.709 mm to 11.606 mm.

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Natural Selection caused the ground finches beak 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.