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3: The birds with small beaks couldn't have any seeds so they died. And the birds with big beaks survived because they could but more seeds in their mouth. It was the portulaca that died off and the tribulus seed was hard to open but at least the birds with big beaks could it eat. Later the average beak size/depth increased.

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2: This caused a decrease in bird population. When it rained it caused a drought in 1977. All the seeds washed away.

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3: *larger beak could eat the tribulus seed
*average beak depth is 10.55 mm and the average beak length is 11.61 mm

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2: *Portulaca dies off # of square meter
* tribulus seed- hard to open

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1: The rainfall increased then decreased. It made a huge impact on the birds with their food, it died off and it killed the birds.

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1: Year 1976, the rainfall was a little over 20mm.

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