Essay
Use the following to answer questions :
Refer to the figure below showing a food web in the grasslands of Yellowstone National Park.[Note: Red arrows refer to animals consumed by carnivores;blue arrows correspond to plants consumed by omnivores and herbivores.]
-The gray wolf preys on elk,but this is not the only possible way in which it affects elk.How might the removal of the gray wolf affect elk indirectly through a trophic cascade?
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