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Do all mammals contain a placenta

Do all mammals contain a placenta?

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Mammals of the monotreme group (that is, platypus and echidnas) are oviparous, egg-laying, and they do not encompass a placenta. Mammals of the marsupial group (that is, kangaroos, koalas and opossums) do not contain a placenta either; females of this group give birth to embryonic young that then carry on growth in the mother’s pouch. Placenta just forms in female placental mammals.

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