In 1995-1996,gray wolves were re-introduced to Yellowstone National Park.Since then,which of the following has occurred?
A) Scavengers are not able to find food.
B) Beaver dams have disappeared from the streams.
C) Elk have increasingly trampled regrowth of aspen,cottonwoods,and willow trees.
D) Shade trees growing along streams have encouraged larger trout populations.
E) Coyote populations have decreased the number of small mammals.

Question

Quizplus · Accepted Answer

The reintroduction of gray wolves to Yellowstone National Park has led to a trophic cascade that allowed vegetation along streams to recover, which in turn provided shade and improved habitat for trout populations.

In 1995-1996,gray Wolves Were Re-Introduced to Yellowstone National Park