Friday, February 27, 2004

Placental Mammal

Any member of the mammalian infraclass Eutheria, characterized by the presence of a placenta, which facilitates exchange of nutrients and wastes between the blood of the mother and that of the fetus. The infraclass Eutheria includes all living mammals except marsupials and monotremes. Some authorities consider the marsupials (infraclass Metatheria) to be placental

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