Mammals that live in the Arctic Ocean have a large amount of blubber, which is a fatty tissue just beneath the skin. Which statement best relates why these animals have so much blubber?

Blubber is made mostly of fat, and fats are lipids. Lipids are poor conductors of heat, so the thick layer of blubber helps reduce heat loss to the cold Arctic water. Therefore, choice B, “Lipids in blubber insulate the animals from cold water,” best explains why these mammals have so much blubber.

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