Who wants to chat with us

answer:

I do.iam excited to make new friends

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 element that provides strength to the exoskeletons of clams and oysters is phosphorus. this is so because calcium carbonate is the main component in the shells.

explanation: