Wolves were reintroduced to Yellowstone National Park in 1995. They began to hunt the abundant elk population, so elk numbers decreased. The elk carcasses provided food for other predators, like foxes, coyotes, and bears, so all of their populations increased. Elk used to overgraze on willow plants; now that willows are growing back, beaver numbers are increasing, because they prefer the slow-moving water that willows cause. Which of these species is a keystone species? (1 point) Responses wolves wolves willows willows bears bears elk

Question

describe people, places, things, or ideas
tell about actions or states of being
name people, places, things, or ideas
describe action or states of being

Answer 1

In the scenario you provided, wolves are the keystone species. A keystone species is one that has a disproportionately large effect on its environment relative to its abundance. In this case, the reintroduction of wolves helped regulate the elk population, which in turn allowed for the regrowth of willow plants. This had cascading effects throughout the ecosystem, benefiting various other species, including beavers and other predators.

As for the definitions you provided:

• "describe people, places, things, or ideas" refers to adjectives.
• "tell about actions or states of being" describes verbs.
• "name people, places, things, or ideas" refers to nouns.
• "describe action or states of being" also refers to verbs.

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