Eutherians are mammals with a _____.

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Eutherians have a placenta, which is a specialized organ that allows for nutrient and gas exchange between the mother and the developing fetus. This is a distinguishing feature of eutherian mammals, as opposed to marsupials (which have a pouch) or monotremes (which lay eggs). Dewclaws are additional digits on the feet of some mammals, and urethral cones are found in male felids but are not a defining characteristic of eutherians.

Eutherians Are Mammals with a _____