As a Consequence of the Reintroduction of the Grey Wolf

Multiple Choice

As a consequence of the reintroduction of the grey wolf into Yellowstone National Park and northern Idaho, the following other wild species have made a comeback:

A) beavers
B) hround squirrels, mice, and gophers
C) willow, aspen, and cottonwood trees
D) all of these answers
E) wolf reintroduction caused other species to decline, not reemerge or increase.