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.

Question

Quizplus · Accepted Answer

Glacial retreat at the end of the last ice age about 18,000 years ago exposed new land for primary succession to occur, leading to dramatic changes in forest communities.

Why Do We Think That the Forest Communities of Eastern