How did the reintroduction of wolves to Yellowstone National Park affect the beaver population?

The wolves decreased the population by eating beavers’ prey.
The wolves decreased the population by eating beavers.
The wolves increased the population by eating a competitor.**********
The wolves increased the population by eating beavers’ predators.

What happened to Yellowstone National Park when wolves disappeared?

The deer population increased.****

Which food source’s scarcity caused the Yellowstone National Park beaver population to decrease? Willow****

What happens to an ecosystem when the primary consumers disappear? The producer population increases, while the secondary consumer population decreases.*****

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