Chapter 21, Problem 3A

Convergent evolution is often seen among species on different islands because

a. island populations are usually smaller and more affected by genetic drift.

b. disruptive selection occurs commonly on islands.

c. island species are usually most closely related to species in similar habitats elsewhere.

d. when islands are first colonized, many ecological resources are unused, allowing descendants of a colonizing species to diversify and adapt to many different parts of the environment.