[Answer] 1. Otters are insulated with dense, heavy fur as opposed to THIS fat which other sea mammals all have:

Step 1 : Introduction to the question "1. Otters are insulated with dense, heavy fur as opposed to THIS fat which other sea mammals all have:"

...1. Sweaters 2. Oleo 3. Hot coffee 4. Blubber It is VERY important to keep those fur coats in good condition. Their grooming ensures that their coats are clean, not tangled, and has air inside the space between the hairs to act as waterproofing.

Step 2 : Answer to the question "1. Otters are insulated with dense, heavy fur as opposed to THIS fat which other sea mammals all have:"

Blubber:

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