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(prevents an abundance of sea urchins from causing)
だと思います

さ や

prevent O from ~ing (Oが~するのを妨げる)

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The presence(S) (of sea otters)(M) prevents(V) an abundance of sea urchins(O) (from causing ecosystem collapse)(M).
※prevent O from ~ing Oが~することを妨げる an abundance of … 多くの…

参考にしてください。

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