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PICTURE:
Medium Ground Finch

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PICTURE:
Tribulus plant

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PICTURE:
Portulaca plant

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During the drought of 1977, medium gorund finches had very little food to help them survive. they had a hard shelled beak, which helped them let Tribulus seeds, which let them live longer, while the birds who couldn't eat portulaca seeds died off

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In 1976, the average amount of Medium Ground Finches was 751. In 1977, a drought happened, and the population dropped to 93.

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SInce the Portulaca plant died off completely, the only food left for the Medium Ground Finches was the Tribulus plant, which had larger, tougher seeds, requiring a longer and tougher beak to eat. The birds with small beaks died off because they couldn't eat these seeds, while the larger beaked bird lived.

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In 1975-1976 there was a navergae of 9 Portulaca seeds per quare meter. Then in 1977 there was a dorugth, where the average dropped down to 4 seeds per square meter. By the end of 1977, the seeds and plant of the Portulaca plant died off entirely, while the larger, tougher seeds of the Tribulus plant lived

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Evidence 2 proves the claim because since the portulaca seeds died off, like Evidence 1 shows, the medium ground finches with smaller beaks were unable to eat the harder, tougher seeds of the Tribulus plant.

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In 1976, the average beak size was 10.7mm. In 1978, it went up to 11.6. Birds with small beaks died off in 1977, and the large beaked birds survived. The average beak length increased.

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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.

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Which mechanism of microevolution caused the beak of the Medium Ground Finch Population on Daphne Major to increase in size From 1976 to 1978?