Scientists Reported That the Reintroduction of Wolves into Yellowstone National

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.

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