The reintroduction of wolves to Yellowstone National Park positively affected the beaver population by decreasing the population of beavers' predators. The correct response is "The wolves decreased the population by eating beavers' prey." This means that by preying on animals that prey on beavers, such as elk, the wolves indirectly reduced the predators of beavers, allowing their population to increase. This is an example of the cascading effect of the reintroduction of a top predator like the wolf in an ecosystem. To find this answer, you would need to understand the ecological relationships between wolves, beavers, and their predators, as well as the impact of predation on population dynamics.
