this ecological balance among sea urchins,sea otters ,and ke

this ecological balance among sea urchins,sea otters ,and kelps became upset during the 19th century,when the populations of the otters were virtually wiped out by excessive hunting for the fur trade.4547

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在海胆,水懒,和海草之间的生态平衡,到了19世纪变的不平衡了.

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