Answer :

Final answer:

The intertidal sea star, Pisaster ochraceus, is a keystone species in the rocky intertidal zone that helps maintain biodiversity and ecological structure.

Explanation:

An example of a keystone species in the rocky intertidal zone is the Pisaster ochraceus, commonly known as the intertidal sea star. This species is crucial for maintaining biodiversity and the structure of ecological communities. When Pisaster ochraceus is removed from an area, mussel populations increase dramatically, which alters the species composition and reduces overall biodiversity. This demonstrates the significant impact a keystone species has on its environment.

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