Refer to the Graph, Showing the Percentage of Aspens Added

question 78

Multiple Choice

Refer to the graph, showing the percentage of aspens added to the Yellowstone National Park forests each decade for a century, with and without the presence of wolves. When present, wolves in the park feed on elk and control the elk population.Elk graze on aspen trees.Based on the graph, one can conclude that when wolves are not present to control the size of the elk population, aspen forests are

• A) not affected.
• B) browsed heavily and disappear completely.
• C) browsed heavily but rebound after wolves return.
• D) browsed less and eventually recover.
• E) browsed less but do not recover.

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