In Yellowstone National Park, wolves were hunted to extinction in the 1920s. A current restoration project has reintroduced wolves to Yellowstone National Park. Predict the response of the Yellowstone ecological community if wolves are a keystone species. A. Species richness should decrease.

B. Species richness should increase, and the relative abundances of each species should be about equal.

C. Species diversity should decrease.

D. The relative abundances of each species should become more unequal.