(B) The correct answer is $B$. Whales,dolphins,and seals are classified as aquatic mammals because they are warm-blooded,breathe air through lungs,and

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(B) The correct answer is $B$. Whales,dolphins,and seals are classified as aquatic mammals because they are warm-blooded,breathe air through lungs,and give birth to live young. Trygon (stingray) and sharks belong to the class Chondrichthyes,which are cartilaginous fishes,not mammals.