No, bats are not marsupials, they are placentals, just like humans, whales, cats and cows.
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.
placenta which is between the mother and the embryo.
All mammal except Monotremata and Marsupial
Placentals
Hedgehogs are placental mammals.