From the names given below select how many of these are mammals: Whales, Dolphin, Shark, Seal, Hippopotamus, Sea cow, Kangaroo.

Four

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Six

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Seven

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Five

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Solution

The correct option is B Six
Class Mammalia - Examples

Whale, dolphin, seal, hippopotamus, sea cows, and kangaroo are categorised as mammals, due to the presence of mammary glands.

Shark is categorised under the class Chondrichthyes as its endoskeleton is made up of cartilage.

Final answer

d. Six

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