How is a mammal developed if not inside of a placenta or a pouch?

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How is a mammal developed if not inside of a placenta or a pouch?

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KandiDempste · Answer 1 · 2024-12-30T19:44:11+0000

hatched from eggs

This is a mammal. But it is unlike placental or marsupial mammals. If a mammal does not develop within a placenta or a pouch, what type of development is left? Eggs!.

How is a mammal developed if not inside of a placenta or a pouch?

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