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How did Peter and Rosemary Grant show that the beak size of finches on the island of Daphne Major is affected by natural selection?

A. They conducted controlled laboratory experiments.
B. They introduced new species of finches to the island.
C. They manipulated the beak sizes of finches artificially.
D. They observed changes in beak size over time in response to changes in food availability.

Answer :

Final answer:

Peter and Rosemary Grant provided evidence for natural selection by observing changes in finch beak sizes on Daphne Major over time. They associated these changes with alterations in food availability due to environmental factors.

Explanation:

Peter and Rosemary Grant, evolutionary biologists, demonstrated how the beak size of finches on the island of Daphne Major is affected by natural selection. They conducted extensive field studies over many years, observing finch populations and measuring their beak sizes. They found that changes in food availability due to environmental factors led to changes in beak size over generations

. It was noticed that during dry years, when hard seeds were the primary food source, finches with larger, stronger beaks survived to reproduce more effectively. Conversely, during wet years when softer seeds were abundant, finches with smaller, more delicate beaks were favored. Therefore, they concluded that the finches' beak size is an adaptation to their environment, influenced by natural selection.

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