The young of placental mammals develop within a placenta. The placenta is a thick membrane that is connected to the inside of the uterine wall. The umbilical cord connects the baby to the inside wall of the placenta. Nutrients and oxygen go from the mother's blood stream through the placenta, down the umbilical cord, and into the baby. The baby releases waste products and carbon dioxide, which travel up the umbilical cord, through the placenta and into the mother's blood stream.
Placentals
Yes. All placental mammals bear live young.
Because placentals are the largest number of mammals.
Placentals are mammals. All mammals are vertebrates which means they do have backbones.
Yes
Marsupials, monotremes, and placentals are all types of mammals. To qualify as a mammal, an animal has to be warm blooded, have hair, and produce milk for its young. Alligators do not fit any of those criteria, because they are reptiles, not mammals. So they are not marsupials, monotremes, or placentals.
they develop their young by laying eggs and teaching them to get food
yes it is a mammal because gives birth to it's young
a young chicken develop because of the sperm cell and the egg cell
yo kitchen lol
Yes.
Yes. The fact that these animals feed their young on mothers' milk is one of the defining characteristics of all mammals, including the placentals, marsupials and monotremes.