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The average beak size increased on Daphne Major for the medium ground finch population. Now that the beak got bigger

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The Portulaca died so the finch had to eat the hard plant known as Tribulus which was to hard for them to eat. So they passed their traits to their offsprings, so over time the beaks got bigger.

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Since there was a drought it caused the soft plant called Portulaca to die. The portulaca was the main source of food for them. which was to hard for them.

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The finch population decreased. In 1976 the population was 751 to 93 in 1978.

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There was a decrease in Portulaca seeds per square mile. Portulaca plant/seed died in the months of November 1977 to February 1978. The Portulaca went to 0 per square meter.

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There was a drought, rain decreased to 20mm in 1977.

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The cause for the beak to increase is natural selection.