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Which of the following procedures was most likely followed to determine the change in beak size?

A. A few finches were trapped in 1981 and again in 1987, and their beak sizes were compared.

B. The beak size in fifteen finches was measured in 1987, and the beak size in the original finches was determined by estimation.

C. The beak size in a large number of finches was measured every year from 1981 to 1987.

D. Finches were captured and bred in 1981, and the beak size of the offspring was measured.

Answer :

Final answer:

This question is most likely referring to the procedures followed by researchers like the Grants who diligently measured beak sizes of the Galápagos finches annually, linking their findings to the changes in environmental conditions and demonstrating evolution due to natural selection.

correct option: (C) The beak size in a large number of finches was measured every year from 1981 to 1987.

Explanation:

The procedure most likely followed to determine the change in beak size was to measure the beak size in a large number of finches every year from 1981 to 1987, option (C). This process aligns with the meticulous research and observations undertaken by Peter and Rosemary Grant who studied the Galápagos finch populations annually. They tracked changes in beak shape distribution and correlated these changes with varying environmental conditions, demonstrating evolution in response to natural selection. For instance, they observed how a drought led to alterations in the average beak size by affecting the availability of seeds, a critical food source for these finches.

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