What are keystone species?

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(D) Keystone species are defined as species that have a disproportionately large effect on their environment relative to their abundance or biomass.Ev

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Species that make up only a small proportion of the total biomass of a community,yet have a large impact on the community organization and survival.

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(D) Keystone species are defined as species that have a disproportionately large effect on their environment relative to their abundance or biomass.Even though they constitute a small proportion of the total biomass of a community,their presence is critical for maintaining the structure,diversity,and stability of the ecosystem.If a keystone species is removed,the ecosystem may undergo drastic changes or collapse.Therefore,option $D$ is the correct description.

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