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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:

The ends of a magnet are called its poles. One end is called the north pole, the other is called the south pole.