In Europe the major mountain ranges run east-west, blocking the migration of species during previous glacial periods.Most North American mountain ranges run north-south and did not block the retreat of species during glacial periods.This suggests that speciation in North America during glacial periods was most influenced by the process of
A) vicariance.
B) topography.
C) free dispersal.
D) climate change.
E) continental drift.

Question

Quizplus · Accepted Answer

The fact that North American mountain ranges run north-south and did not block the retreat of species during glacial periods indicates that speciation in North America during these periods was most likely influenced by free dispersal, as species were able to move relatively freely across the continent.

In Europe the Major Mountain Ranges Run East-West, Blocking the Migration