What is a keystone species?

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A rare species that has minimal impact on the biomass and on other species in the community.

A dominant species that constitutes a large proportion of the biomass and which affects many other species

A species which makes up only a small proportion of the total biomass of a community, yet has a huge impact on the community's organization and survival

A common species that has plenty of biomass, yet has a fairly low impact on the community's organization

answer is C.

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Detailed Solution

A keystone species is the type of species that makes up only a small proportion of the total biomass of a community yet has a huge impact on the survival and organisation of that community. These help in defining the survival of an entire ecosystem.

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