What group of mammals have (a)embryos that spend more time feeding through the placenta than the mother's nipples,(b)young that feed on milk,and (c)a prolonged period of maternal care after leaving the placenta?

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Eutheria, or placental mammals, have embryos that spend more time feeding through the placenta than the mother's nipples. They also have young that feed on milk and a prolonged period of maternal care after leaving the placenta. Marsupials have a shorter period of placental development and rely on their mother's nipples for a longer time. Monotremes are unique in that they lay eggs and do not have a placenta.

What Group of Mammals Have (A)embryos That Spend More Time