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answer:Wolves were reintroduced to Yellowstone National Park in 1995. This keystone species restored the park’s ecosystem. What is the ecological value of a keystone species?

A.They influence the survival of many other species in an ecosystem.

B.They prevent the ecosystem from changing and growing.

C.They protect land and water resources within the ecosystem.

D.They decrease the number of unwanted species in an ecosystem.

Explanation:

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the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.