Most marsupials move on legs just like other mammals.
No.
Firstly, all marsupials are mammals. However, not all mammals are marsupials. The jerboa is a mammal, but it is a rodent and not a marsupial.
Dolphins are placental mammals.
No. Seals are placental mammals.
No. Armadillos are placental mammals.
No, horses are equine mammals. They are not marsupials
Most mammals are placental...marsupial mammals and monotremes are not placental.
A wallaby is a marsupial. The only monotremes, or egg-laying mammals, are the platypus and the echidna.
No. Camels are placental mammals.
No. Hyenas are not marsupials. They are placental mammals.
Marsupials are mammals.Dolphins are mammals but not marsupials. A marsupial is a mammal that carries its babies in a pouch. Dolphins do not have pouches.
Opossums are marsupial mammals - they have internal fertilization as all mammals do.