Yes
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.
Theria is the closest connection between marsupials and placentals. It includes all mammals besides the monotremes.
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Yes.
Placentals are a group of mammals characterized by the presence of a placenta, which allows for a longer gestation period and more developed offspring at birth compared to other mammal groups like marsupials. They are the most diverse group of mammals, including species such as humans, whales, and elephants. Placentals are typically classified into three main groups: Afrotheria, Xenarthra, and Boreoeutheria, each with unique evolutionary adaptations. Their reproductive strategy enables them to provide a stable environment and nutrients to the developing fetus, increasing the chances of survival.
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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