The Great Ice Age accounted for the origins of North America's human history because
A. it exposed a land bridge connecting Eurasia with North America.
B. the glacial withdrawal allowed migration from South America.
C. the glacial withdrawal formed freshwater lakes that supported life.
D. when it ended, European migration to the west became possible.
E. it prevented the migration of dangerous animals from the Bering isthmus.
Answer: A
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