Refer to the figure. 
According to the figure, which statement best describes the changes undergone by plant communities in the past 9,000 years (9 ka) ?
A) Boreal forests and forest tundra are moving southward.
B) Prairie is beginning to overtake southeast forest.
C) Most forests are becoming mixed forests.
D) Northern forests are tending to move southward.
E) Southern forests are tending to move northward.
Correct Answer:
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