Mammary glands are without teats in

Prototheria

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Metatheria

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Eutheria

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Theria

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Solution

The correct option is A Prototheria
Monotremes or Prototheria are mammals that do not give birth to live young ones. Instead, they lay eggs and nurse them after they have hatched. They have mammary glands but no teats. They simply pour milk onto their skin and it gets collected in a pouch where the babies can drink it from.
So the correct answer is 'Prototheria'.

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