Question

Which best describes biogeographic isolation?
It always leads to the formation of new species.
It cannot lead to evolution.
It is a mechanism for evolution.
It occurs only through geographic forces.

Answer 1

"It is a mechanism for evolution."

Explanation: biogeographic (geographic) isolation reduces or stops gene flow between populations, allowing them to diverge by mutation, drift, and selection — potentially leading to speciation. It does not always produce a new species and it can lead to evolution, so the other statements are incorrect.