Biology

The correct answer is: C.Wolves

The wolves in Yellowstone National Park are considered a keystone species. They play a critical role in controlling the population of herbivores, particularly elk, which in turn affects the vegetation and structure of the entire ecosystem.

Here’s a brief explanation of the other options:

A.Elk: While elk are a significant part of the ecosystem, they are not a keystone species. Their population is controlled by wolves, and they are more affected...