Question

question: why did selection increase genetic variation among finches on the different islands?

Explanation:

Finches on different islands face different selection pressures like food availability and predators. Mutations occur randomly, and selection acts on these variations. Different selective forces on each island favor different traits, leading to increased genetic variation as finches adapt to their specific island - environments.

Answer:

Different selection pressures on each island act on random mutations, favoring different traits and increasing genetic variation among finches on different islands.