Hairs occur in all mammals except those of

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(C) Mammals are characterized by the presence of hair on their skin. However,in the order $Cetacea$ (which includes whales,dolphins,and porpoises),hai

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Cetacea

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(C) Mammals are characterized by the presence of hair on their skin. However,in the order $Cetacea$ (which includes whales,dolphins,and porpoises),hair is either completely absent or restricted to a few sensory bristles around the mouth in adults. This is an adaptation to their fully aquatic lifestyle,where hair would increase drag and interfere with swimming efficiency.

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