Scientists reported that the reintroduction of wolves into Yellowstone National Park initiated a trophic cascade.Which factual statement best supports this conclusion?
A) Wolves prey on a number of species, but they prefer elk.
B) Mountain lions and coyotes, as well as wolves, prey on elk.
C) After wolves were reintroduced, the numbers of mountain lions remained constant.
D) After wolves were reintroduced, the numbers of aspen trees increased.
E) After wolves were reintroduced, the numbers of elk declined.

Question

Quizplus · Accepted Answer

The increase in aspen trees after wolves were reintroduced is a direct result of a trophic cascade. Wolves reduced elk populations, which in turn allowed vegetation like aspen trees to recover, demonstrating the cascading effect on the ecosystem.

Scientists Reported That the Reintroduction of Wolves into Yellowstone National