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The population started dying and couldn't eat the Tribulus since most of there beaks were not long enough. In 1976 population was 751 and in 1978 the population was 90 of 243 where tagged. So this means that most of them died and only the birds with the longer beaks lived and then had kids causing there to be so many others that aren't tagged.

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Before Drought the average beak depth was 9.469mm and the average beak length was 10.709mm and the average population size was 751. After the drought the average beak depth was 10.546mm and the average beak length was 11.606mm, and the average population size was 243. Date from "Lab 18 Finch Data slides "Population Size By Month and Finch Characteristics In 1976."

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The drought cause the Portula seeds to go basically exactinged and was the Portula where the easys seeds for the birds to eat. Portula seeds went to 0 since the drought isn't letting them grow more seeds. This lead for the birds to eat them really quickly and since the seeds couldn't grow back the seeds where gone. Portula seeds where soft and Tribulus where hard.

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Before the drought the seeds per month average was Portula:4 Tribulus:6. During the drought the seeds per month average was Portula:3 Tribulus:9. After the drought the seeds per month average was Portula:0 Tribulus:4. Data from "Lab 18 Finch Data slide Seed Type Abundance."

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The reason why in 176 the rainfall was at 140 was because the drought was about to start, and you see in the next year 1977 the rainfall was only 20mm and without rain the plants cant grow. The birds need the plants to live so they can eat them

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The rain fall on Daphne Major in 1976/ before drought was 130mm. In 1797 the rain fall was only 20mm. Also, in 1798 the rain increased to 540mm. Data from "Lab 18 Finch Data slide Rainfall by Year."

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Natural Selection is the Mechanism of Microevolution caused the beak of the Medium ground finch population on Daphne Major to increase in size from 1976 to 1978.