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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:

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.