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To show that natural selection was the mechanism of microevolution you need the beak sizes from 1976 to 1978. You need this because this shows that when the small beaked Finches die out because they don't have food the only thing left were the big beaked Finches. This leaves their offspring to only be big beaked Finches because there is no more small beaked finches on Daphne Major.

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According to google, in 1976 the average beak size for the Medium Ground Finch was 10.7mm long and 10.2mm deep. In 1978 the average beak size for the Finch was 11.6mm long and 10.5mm deep.

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According to google sheets, from November of 1977 to December of 1978 the Portulaca plant (soft seeds) had an average of 0 seeds per month. From November of 1977 to December of 1978 the Tribulus seeds (hard seed) had an average of about 5 seeds per month.

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This piece of evidence show that natural selection is the mechanism of microevolution because The finches decreased leaving the only the Finches with the big beaked birds left. I know this because the drought cause the Portulaca seeds to die out and the small beaked birds couldn't eat the other plant (Tribulus seed) because is was too hard and they couldn't' crack the shell. This led the small beaked birds to die and leaving the big beaked birds left.

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The amount of seeds is a important piece of evidence to have because this also shows that natural selection was the mechanism to microevolution. This is because the Portulaca seed died out because of the drought on Daphne Major. This would increase the beak size because the the only food left is the Tribulus seed which is the seed with the hard shell and some brids couldn't eat this.

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This piece of evidence shows that natural selection is the mechanism of microevolution to increase the size of the beak. I know this because natural selection is when there is when there is an environmental change and the organisms adapt to it to be able to live longer.   The drought was an environmental change to Daphne Major this caused the Finches beaks to change.

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According to google sheets, November of 1976 the Finch population on Daphne Major was 751 Finches. In November of 1978 the Finch population was 243 Finches.

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According to google sheets, in 1976 the average rain fall on Daphne Major was 130mm. In 1977 the average rain fall was 20mm.

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Natural Selection is the mechanism of microevolution for the medium ground Finch to increase in beak size from 1976 to 1978.