How do you placenta mammals develop?

Placental mammals develop through a unique reproductive process where the embryo forms within the uterus and is nourished via the placenta, an organ that connects the developing fetus to the mother's blood supply. This allows for efficient transfer of nutrients, gases, and waste products between the mother and the fetus. The gestation period varies among species, during which the fetus undergoes significant growth and development, eventually being born as a relatively mature offspring. This method of reproduction provides enhanced protection and support compared to other methods, such as laying eggs.