Question

Which statement best describes a keystone species?

Answer 1

The correct answer is option d. its absence would affect many organism present in the community.

The keystone species are the one, who play a very important role in the ecosystem. In case, the keystone species is wiped off from a particular ecosystem, then  the function of the ecosystem would cease and lead to a major effect. Hence, the keystone species is very important for the survival of ecosystem.

Answer 2

The answer is D. The definition of keystone species is a species on which other species in an ecosystem largely depend, such that if it were removed, the ecosystem would change drastically.