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E: The birds with bigger beaks started to increase their population.
R: The only birds after the drought left was the group of larger, stronger beaked Ground Finches. So, they mated together and their offspring came out with larger beaks like their parents, causing the population of bigger beaked Ground Finches to increase after the drought.

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E: "Over time, genes that determine traits that are associated with an increased chance of survival and successful reproduction will become more common in a population, and genes that determine traits that decrease an individual's chance of survival or reproduction will become less common." Stated page 306 of Lab Handout 18.
R: Natural Selection in Daphne Major acted in the same way. The smaller beaked birds (Decreased chance of survival because of that certain trait) chance of reproduction wasn't common at all because they died not being able to eat the larger seeds left after the drought. The larger beaked birds (beak depth: 10.55 mm and length: 11.61 mm) survived because they had the trait that allowed them to survive and conduct reproduction more commonly, making the population mainly larger beaked.

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E: https://docs.google.com/drawings/d/1ob8dLBf82Di5a_nwSUb587IgcflG0mn-NozFqwmQL0c/edit?usp=sharing
R: The smaller beaked birds starved because they weren't able to eat the more abundant tribulus seeds that were too large and tough, and the portulaca seeds died during the drought. The bigger beaked birds survived because they were able to eat the tribulus seeds and kept breeding more and more larger beaked birds while the smaller beaked genes died out.

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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

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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

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natural selection is the mechanism of microevolution that caused the beak of the medium ground finch population on daphne major to increase in size from 1976 to 1978.