Question

the first people to explore the galapagos islands noticed that the finches there are different species than the finches living on the nearby mainland. which most likely caused this example of speciation? a. unhealthy conditions on the islands caused severe mutations. b. the birds had different mating seasons and could not interbreed. c. adaptation stopped on the mainland but continued on the islands. d. the water between the mainland and islands prohibited interbreeding.

Explanation:

Speciation often occurs due to reproductive isolation. Geographic isolation, like the water - barrier between the mainland and islands, can prevent gene flow and lead to speciation over time. Unhealthy conditions causing severe mutations (A) is not the most likely cause here. Different mating seasons (B) is a form of pre - zygotic isolation but not indicated as the case. Adaptation not stopping on the mainland (C) is incorrect as adaptation is an ongoing process everywhere. The water between the mainland and islands created a physical barrier that prohibited interbreeding, leading to speciation.

Answer:

D. The water between the mainland and islands prohibited interbreeding.