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When most of the small beaks had died off there was only the big beaks left which left only the big beaks to breed with each other causing the bigger beak population to grow in size.

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The amount of rainfall was decreasing so the ground finches were not getting enough water supply and that was causing even more of the small beaks to die off because they are losing their only food and water supplies.

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The portulaca seed was the small beaks main food supply so when the portulaca seeds started to go away the small beaks main food supply started to decrease they started to die off.

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The bigger beaks produced more offspring

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The amount of rainfall decreased

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The amount of portulaca seeds decreased

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Natural selection and drought caused the beak of the medium ground finch population on Daphne  Major to increase in size from 1976-1978