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Egg-laying mammals are grouped as [[1]].

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answer is PROTHERIA.

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Detailed Solution

Egg-laying mammals are grouped as Prototheria.

Mammals are warm-blooded animals that possess hairy skin, external ears, and mammary glands for nourishing their young ones.

Prototheria is a subclass of primitive mammals that includes egg-laying mammals. These mammals are confined to the Australian continent.

All mammals except Prototheria are viviparous.

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