Which group of animals will bear live young that are underdeveloped and must stay in the mother's pouch to complete their development?

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Marsupials are a group of mammals that give birth to live young who are underdeveloped and must complete their development inside the mother's pouch, where they can also nurse. This is different from placental mammals, who give birth to more developed young that have already received nourishment from the mother through the placenta. Prokaryotes are a type of single-celled organism, and angiosperms are flowering plants that reproduce through seeds.

Which Group of Animals Will Bear Live Young That Are