Sea otters protect kelp forests by consuming the sea urchins that chew through the kelp holdfasts. The ecosystem of a kelp forest would go through drastic changes including significant damage to the kelp and all organisms that depend on the kelp if the sea otther was removed. This is a perfect example of:

Commensalism

Explanation:

Commensalism is a biological association where two organisms interact and one of the two benefits while the other neither benefits nor get harmed.

In this case, Sea otters neither benefits nor get harmed, while kelp benefits mainly in terms of protection provided by sea otters.

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-lavira: )