Placental mammals differ from marsupials in that?

Question

Marsupials do not nurse their young
Marsupials lay eggs
Marsupials develop mostly outside their mothers body
Marsupials live only in North America

Answer 1

The third one.

Answer 2

It's been a while since I've had to think about marsupial's, so pardon me if I get this wrong. Marsupials' differ from other mammals BECAUSE their young are NOT fully developed by birth. Henceforth, the young need to stay INSIDE of a pouch like area to nurse, continue growing and to survive. Marsupial mammals live in Australia. The ONLY egg-laying mammal known anywhere in the world is the platypus. This is one of those creatures that makes Darwin's' theory of evolution seem very far fetched. Either that, of G-D was using marijuana that moment. Think about it for a minute; here's a creature that's clearly a mammal with a duck's bill, a beavers tail, raccoon-like feet, AND it lays eggs!!! For the record, all apologies to the Almighty, it's a joke only about Him smoking pot!