Which of the following is the best explanation for why finches on one of the islands in the Galapagos have large beaks while finches on another island have small beaks?

Finch populations can develop different beak sizes over generations through natural selection. When food sources differ and finches compete for resources, individuals whose beaks are better suited to the available food are more likely to survive and reproduce. This makes choice A, adaptation as a result of competition for resources, the best explanation. Finches do not change their beaks on purpose, and large beaks are not always better in every environment.

AI-written and checked against the verified answer.