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Smaller/thinner beak finches died due to their inability to eat the only food source left-Tribulus.

The drought that occurred on Daphne Major caused the Portulaca seeds to decrease in numbers because they are less resistant than and need more water than the Tribulus seeds. The environment changed, so the population of the finches also changed. They needed to have stronger beaks, which was possible to adaptations.

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Portulaca plant died due to Lack of water (soft seed).

All food source decreased.

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Drought in 1977.

The rainfall only 25mm.

Drought caused food shortages.(Water is needed for plants to grow.)

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Medium Ground Finch that had small beak died.

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Their food and water decreased.

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The amount of rainfall decreased.

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Natural Selection caused the beak of the Medium Ground Finch population of Daphne Major increase in size from 1976-1978.

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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?