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Natural selection cause the beak of the medium ground flinch to increase in size on daphne major from 1976 to 1978.

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One of are evidence could be that, we got the statistics of the amount of birds studied with different sized beaks.

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Another piece of evidence that i have is my group and i wanted to make a graph to put all the data on.

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My reasoning is that natural selection increased in beak size because the birds with longer beaks are able to get more seeds to survive longer. Also if the birds have a greater beak depth ,they can eat the hard shells to.

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My last piece of evidence would be that their was a drought causing the small seeds to die.