Monotremes are unique mammals because they

Monotremes are unique mammals because they ________ ?

1. posses hair

2. give birth to live young

3. secret milk in a pouch

4. lay eggs

Correct Option: Option D,

lay eggs

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Monotremes are a group of mammals that form the order Monotremata. Monotremes are the only mammals that lay eggs, but they also feed their babies with milk. The word 'monotreme' refers to their common rear opening, the cloaca.