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Arctic and Antarctic fishes have unsaturated fatty acids. Why ?
Answer
Unsatured fatty acids help to maintain the fluid nature of the cell mebrane and prevent it from freezing in the cold climate. They also provide insulation from the cold. The fluid nature of the cell membrane is very important for various life processes. Therefore, in order to keep their membranes flexible and insulation the Artic and Antarctic fishes have unstaurated fatty acids.