Organisms that live in freshwater and marine biomes have developed unique adaptations that aid in their survival. Which of the following adaptations does not help an animal move through the water?

A thick layer of blubber mainly provides insulation and energy storage, helping animals stay warm in cold water; it does not help them move through the water. Streamlined bodies, flippers and flattened tails, and smooth, nearly furless bodies can all reduce resistance or provide propulsion. Therefore, the answer is B, “thick layer of blubber.”

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