Upon His Return to England,Darwin Realized That the Species He

Multiple Choice

Upon his return to England,Darwin realized that the species he had seen in the Galápagos Islands were distinctive to that locale.Which of the following statements best explains the uniqueness of the assemblage of species that Darwin observed?

A) Very little genetic drift was occurring, because the island populations were relatively large.
B) The islands were too remote for human occupancy; therefore, the habitat modification that humans introduce had not yet occurred.
C) No DNA mutation was occurring among the various island species.
D) Very little gene flow was occurring, because the islands were so distant from the mainland.