Yes. Dolphins are placental mammals because they do not have a pouch like most marsupials, and they do not lay eggs like the monotremes.
Placentals are mammals. All mammals are vertebrates which means they do have backbones.
Yes
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Yes.
an ugly tsamanian devil
Monotremes, marsupials, and placentals
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.
All foxes, including the red fox, are placentals.