Why Do We Think That the Forest Communities of Eastern

question 54

Multiple Choice

Why do we think that the forest communities of eastern North America have changed dramatically over the past 18,000 years?

• A)Glacial retreat exposed land for primary succession that long ago.
• B)Large fires exposed land for secondary succession that long ago.
• C)Successional changes are typically very rapid and all communities change at this speed.
• D)Pollen evolved at this time.

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