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What did the purple sea stars help to do on Tatoosh Island?
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What did the purple sea stars help to do on Tatoosh Island?

User Pcom
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"In the 1960's, the purple sea star was one of the first species recognized as a keystone. Its presence keeps tide pools in balance and prevents mussels from taking over the ecosystem."Step-by-step explanation:

User Dima Bildin
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