Question: Which factor has been considered to be most important in causing shifts from grassland to shrubland in the southwestern United States? a. Excessive fire b.

Which factor has been considered to be most important in causing shifts from grassland to shrubland in the southwestern United States?
a. Excessive fire
b. Climatic change
c. Increases in grasshoppers
d. Increases in rabbits and rodents
e. Destruction of the bison

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