What is the nature of development in non-placental mammals?

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What is the nature of development in non-placental mammals?

2007-02-18 13:28:55 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Biology

3 answers

Well monotremes lay eggs.

Marsupials give birth to a foetus which finds its way in to the pouch and can get fed there, it becomes in effect a 2nd womb, one that can be left for short spells and then returned to.

2007-02-18 14:11:04 · answer #1 · answered by Leviathan 6 · 0⤊ 0⤋

There is no such thing as a non-placental mammal.

2007-02-18 21:45:11 · answer #2 · answered by Joan H 6 · 0⤊ 1⤋

Don't know what you mean. Probably you're talking about spiny echidnas and platypus, which are egg-layers both, I believe.

2007-02-18 21:36:55 · answer #3 · answered by Anonymous · 0⤊ 0⤋