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

question 221

Multiple Choice

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.

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