Amongst the following mammals which of the following is a monotreme?

Macropus (Kangaroo)

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Ornithorhynchus (Platypus)

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Balaenoptera (Blue whale)

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Elephas (Elephant)

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Solution

The correct option is B Ornithorhynchus (Platypus)
A monotreme is a primitive mammal that lay eggs and has a common opening for the digestive system and urogenital. Platypus is an egg-laying mammal. It lay eggs in the nest made up of grass and leaves.
Kangaroo is a marsupial and gregarious mammal.
Blue whale and elephant give births to the young ones.
Thus, the correct answer is (B).

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