What is a keystone species?

Options

A. A rare species that has minimal impact on the biomass and on other species in the community
B. A dominant species that constitute a large proportion of the biomass and which affects many other species
C. A species which makes up only a small proportion of the total biomass of communities yet has a huge impact on the communities organization and survival
D. A common species that has plenty of biomass yet has a fairly low impact on the community organization

Answer

C

Explanation

Keystone species is a species though having a small population has a major influence on the composition of the community because of its key role in maintaining the community structure through regulation of trophic level during adverse condition.