During the retreat of continental glaciers in North America during the past 18,000 years, there were some plant communities present that have no present analogs. Which of the following is not a reason that communities did not move due to changes in climate?
A) Individual species differ in dispersal rates.
B) Individual species differ in acclimation and adaptation rates.
C) Biotic interactions, including competition and mutualisms, were altered.
D) Humans caused habitat fragmentation and selective harvest of certain plant species.
Correct Answer:
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