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Tribulus seed

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Portulaca seeds

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This evidence supports my claim because they didn't have anything to eat because all of there food died because there was a drought in 1977 which has to do with the environment therefore it has to be natural selection because natural selection is caused when the environment causes a change in a population

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This evidence supports my claim because the thin beaked finches could only eat the portulaca because there beaks aren't that strong and all of there food all died because of the rainfall drought therefore they couldn't eat anything so most of the thin beaked population died.

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Natural selection is when the change was caused by the environment, and this shows that the environment had a roll in this change because there was not enough rain to keep the plants that they are able to eat growing therefore they died because they couldn't eat the other plants because there beaks were too weak.

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The small thinned beak finches died because they cannot eat the hard tribulus which have a hard seeds. In 1976 there where 751 finches that had small thin beaks that they tagged. In 1978 there were 90 tagged finches left and 243 thick long beaked finches now on the island.

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The portulaca a plant that is small and soft and easy for the small thinned beaked finches to eat decreased to 0 in 1977.

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A drought happened in 1977 in which rainfall decreased 20mm.

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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 form 1976-1978