Pisaster is a . . . . . . .

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(B) Pisaster is a genus of sea stars (starfish) found along the rocky intertidal zones of the Pacific coast of North America.It is a classic example o

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Species of starfish

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(B) Pisaster is a genus of sea stars (starfish) found along the rocky intertidal zones of the Pacific coast of North America.It is a classic example of a keystone species used in ecological studies.In an experiment conducted by Robert Paine,when all starfish (Pisaster) were removed from an enclosed intertidal area,more than $10$ species of invertebrates became extinct within a year due to interspecific competition.

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