placenta which is between the mother and the embryo.
Placentals are mammals. All mammals are vertebrates which means they do have backbones.
Yes
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Yes.
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Monotremes, marsupials, and placentals
Because placentals are the largest number of mammals.
All mammal except Monotremata and Marsupial
Placentals
Hedgehogs are placental mammals.
All foxes, including the red fox, are placentals.
It is called the gestation period.