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Hair occur in all mammals except those of

1. Rodentia
2. Chiroptera
3. Primata
4. Cetacea

Correct answer: Cetacea

Solution

Cetacea (whales, dolphins, and porpoises) are the mammalian group that lacks hair in the adult stage. Their smooth, nearly hairless bodies reduce drag in water, unlike rodents, bats, and primates which retain hair.

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