The group of mammals that reproduce by laying eggs and generally have more primative traits than other are what?

The group of mammals that reproduce by laying eggs and generally have more primitive traits than other mammals are called monotremes.

Here are some key characteristics of monotremes:

* Lay eggs: Unlike other mammals, they don't give birth to live young.

* Primitive traits: They have features that resemble reptiles, such as a cloaca (a single opening for waste and reproduction) and a pouch where they incubate their eggs.

* Echidnas and platypuses: The only surviving monotremes are echidnas and platypuses, both found only in Australia and New Guinea.

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