Which young develop briefly in their mother's body, nourished by egg yolk and by nutrients that diffuse from the mother's tissues?

Name: Which young develop briefly in their mother's body, nourished by egg yolk and by nutrients that diffuse from the mother's tissues?
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Marsupials, such as kangaroos and koalas, give birth to underdeveloped young that continue to grow and develop in the mother's pouch, initially nourished by egg yolk and then by milk from the mother.

Which Young Develop Briefly in Their Mother's Body, Nourished by Egg