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Natural selection was the mechanism of microevolution that caused the beak of medium ground finch population in Daphne major to increase in size from 1976 to 1978.

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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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The beak length will make it so the bird can eat. Usually if the beak is too small then the bird can't get the bugs, worms, seed, and other food from the ground, therefore not surviving when the drought comes and makes the bugs go deeper into the ground where there is more water. Individual #13 had a beak length of 8.91, which was smaller then most, which is one of the reasons that individual didn't make it past the drought. #35 had the length of 10.16, and because of that length #35 survived the drought.

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Each creature in this world right now has a mother and a father, the Finches has a mother and a father. When they were born you got to get a better look to see if all the birds were like their mom or their dad, but sometimes, the grandparents could have a look alike trait that goes into the child, that is just because the parent didn't inherit one of the traits, so then it carried that gene then gave it to their child.

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The average bird lays 3-4 eggs. That mean 3-4 babies. The population during the drought decreases dramatically. More birds die each year than usually are born each year. November of 1976, there were 751 Finches. The next November of 1977, there were 186. that is a drop os 565 finches all in one year, not to mention that they still had babies birds during this time too. The next November or 1978, there were 243, this one went up, because it was closer to the end of the drought and all the birds that were still alive at this point were strong enough and had kids with those same traits.

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There was exactly 130mm of rainfall that year.

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There was exactly 20 mm of rainfall that year.

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There was exactly 540mm of rainfall that year.

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There was exactly 50 mm of rainfall that year.

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P-8, T-3. This was the seed data for 1976.

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P-8 , T-10 . This was the seed data for 1977.

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P-0, T-5. This was the seed data for 1978

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P-0, T-4. This was the seed data for 1979.