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Q.

Which of the following mammals lay eggs?

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a

Mole

b

Mongoose

c

Whale

d

Platypus

answer is C.

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Detailed Solution

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Platypus (Ornithorhynchus anatinus) belongs to the monotreme family of mammals. It also includes the Echidna. They are the only mammals that can lay eggs. 
Monotremes are an excellent model organism for studying mammalian evolution.
 

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