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This is a drought showing almost no water.

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Portulaca plant having small seeds for small beaks.

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Large beaked finch.

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Small beaked finch.

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There beaks can fit only so much things in that the only food source they can eat are all gone so they begin starving to death.
This leaves the large beaked ones alive.

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These plants need water to survive so they can make food with only little water a large number of these plants begin to die.

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The drought caused water damage and loss/lack of water only leaving 20cmm.

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Small Beaked finches die due to inability to eat the only food source left.

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Portulaca plant dies due to lack of water.(soft seed)

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The drought in 1977 only gave 20 mm of rainfall.

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Which Mechanism of Microevolution 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 caused the beak to increase in size.