Refer to the Graph, Showing the Interaction Between the Elk

Refer to the graph, showing the interaction between the elk population and the presence or absence of wolves in Yellowstone National Park. Elk culling (hunting by humans) occurred until 1968.Based on this information, what factor had the most influence on the population of elk between 1926 and 1968?

A) Wolf predation
B) Culling by humans
C) Predation by both wolves and humans
D) Lack of predation
E) A factor other than predation

Correct Answer:

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