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Monotremes, marsupials, and placentals
Placentals are mammals. All mammals are vertebrates which means they do have backbones.
Yes
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Yes.
Because placentals are the largest number of mammals.
All mammal except Monotremata and Marsupial
placenta which is between the mother and the embryo.
Placentals
Hedgehogs are placental mammals.
Yes. Dolphins are placental mammals because they do not have a pouch like most marsupials, and they do not lay eggs like the monotremes.
All foxes, including the red fox, are placentals.