All of the following are mammals that live en | vedclass

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(A) The organisms listed are aquatic,but they belong to different biological classes.$1$. Dolphins are aquatic mammals belonging to the order $Cetacea

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Penguins

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(A) The organisms listed are aquatic,but they belong to different biological classes.$1$. Dolphins are aquatic mammals belonging to the order $Cetacea$.$2$. Seals are semi-aquatic marine mammals belonging to the order $Carnivora$.$3$. Sea cows (manatees and dugongs) are fully aquatic herbivorous mammals belonging to the order $Sirenia$.$4$. Penguins are flightless birds belonging to the class $Aves$.Therefore,penguins are the only organisms in the list that are not mammals.

All of the following are mammals that live entirely in water,except:

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