sea otters, which are essential to keeping sea urchins in check, allows sea urchin populations to explode. The sea urchins feast on and decimate the kelp beds, which are critical habitat for spawning fish. Fish begin to decline for lack of spawning habitat; this affects fishermen's catches. Finally, an international treaty is enacted to protect sea otters. In areas where the otters recovered, urchin populations are once again kept down, the kelp beds recover, fish nurseries recover, and fish…
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