Which of the following typical adaptations of marine animals is not found in sea otters?

Sea otters have streamlined bodies, webbed feet, and very thick fur that helps keep them warm. They breathe air through nostrils near the front of the snout, not through a breathing apparatus on top of the head. That top-of-the-head feature is typical of animals such as whales, so the answer is “breathing apparatus on the top of the head.”

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