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- Environmental Change and evolution packet
- Cause and effect worksheet

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Since the plant died off the small beaked are very close to extinction. So the larged beaked are slowly getting close to being the only medium ground finches.

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The smaller beaked finches died off because they couldn't open the tribulus plant (which had a hard shell.) So the larger beaks kept reproducing while the smaller beaks were nowhere to be seen thus creating a very great population of large beaked finches.

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The Portulaca plant was the easiest to open for all types of beaked finches, but it was especially easy for the small beaked.

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The average beak size increased on Daphne Major for the medium ground finch.

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The smaller beaked birds died off from not being able to crack open the tribulus plant (hard shell.)

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There was a shortage of Portulaca plants (soft shell.)

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Natural selection caused the beak of the medium ground finch population on Daphne Major to increase in size from 1976 to 1978