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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.

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I claim the reason  the population went down was because of natural selection.

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After the drought most of the finch population died out and due to them not having a strong enough beak to get food to survive the finches started to be born with big beaks since 75% of population all died out since most of the finches were small beaks.

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The plants for each of them had decreased each month but after the drought their were between 0-4 plants left of the portulaca but for the Tribula their was between 4-6 Tribulus plants left. Which makes the smaller beaks with less to no food.

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The population decreased so much during this time but the population started to increase because the small beaked birds might have died but the big beaked birds still helped the birds start to reproduce again.

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The drought in 1977 caused the finches to die out due to starvation and since they could not find the small seeds and, they could not break the big seeds so they evolved to have bigger beaks to crack them. The ones with big beaks were naturally made for big beaks.

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The reason the Tribulus had more plants left is most likely a plant that makes bigger seeds because the plants with smaller seeds were eaten out faster which proves the portulaca was a plant that made seeds that were not super big but not small enough.

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The population before the drought had every type of plant and animals and beak size but this proves if migration it would have told us but if it was mutation then why did the population drop super fast but this shows they starved to death because of the size of there beaks. But the bigger beaks started to grow so then the big beaked birds started to help the population grow again