It Has Been Observed That Organisms on Many Islands Are

Multiple Choice

It has been observed that organisms on many islands are different from, but closely related to, similar forms found on the nearest continent. Which of the following possible conclusions is best derived from this observation?

A) Island forms are descended from mainland forms.
B) Common environments are inhabited by the same organisms.
C) Island forms and mainland forms have identical gene pools.
D) The island forms and mainland forms are converging.