Which factor has been considered to be most important in causing shifts from grassland to shrubland in

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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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Range Management Principles and Practices

ISBN: 978-0135014165

6th edition

Authors: Jerry L. Holechek, Rex D. Pieper, Carlton H. Herbel

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