# data[].attributes.body
Portulaca

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Tribulus

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Drought

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Ground Finch

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This evidence supports the theory of natural selection because it was a mutation that caused the beaks to be larger. When the drought came, only the birds with large beaks survived and reproduced. All the birds with the large beaks would have passed down the mutation to their offspring and the cycle would continue.

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Before the drought, the average beak length was 10.71. After the drought, the average beak length was 11.61.

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Because there were fewer seeds after the drought and no portulaca seeds left at all, this left the birds with smaller beaks unable to eat the tribulus seeds. This caused only the birds with bigger beaks to survive.

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The amount of seeds on the island decreased to 0 portulaca per meter square and 5 tribulus per meter square.

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The drought caused the portulaca and tribulus seeds to die and the birds that had the smaller beaks were unable to eat the tough tribulus seeds.

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The bird's average beak size increased due to natural selection.

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There was a drought in 1977 when only 20 mm of rain fell the entire year.