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Natural selection caused the beak of the medium ground finch to increase in size from 1976 to 1978

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As time went by the new beaks had similar sizes to the old beaks

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the beak size changed because after the drought there was only 130 mm of rain, before the rain, there was 540 mm of rain.

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In 1976 the portulaca and tribulus average plant seeds per square meter were 11.3(P) and 10.5(T) in 1978 the average seeds per square meter were 0.42(P) and 5.1(T)

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he drought caused the plant life to suffer because they were not getting all the nutrients  they needed, therefore the plants were not getting enough water they needed so they couldn't grow or reproduce more

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The drought caused less plants to grow because there was no rainfall. After the drought the portulaca stopped growing so there was a need for hard beaks to be able to open the tribulus seed.

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The portulaca and the tribulus are 2 different types of seeds. The tribulus was a hard seed. While the portulaca plant was a easy to access plant. This later then caused more birds to eat the portulaca plant.

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the process whereby organisms better adapted to their environment tend to survive and produce more offspring.

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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?