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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.
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User Breberaf
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A) they influence the survival of many other species in an ecosystem.
User Ranjithkumar
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