Question

what is eutherians and example ?​

Answer 1

Answer:

Any from the group of mammals possessing chorioallantoic placenta (as opposed to other mammalian groups)Mammals may be grouped according to placentation. Placenta surrounding the fetus is made up of a single maternal layer (i.e.endometrium), an outer embryonic layer (i.e. chorion), and an inner embryonic layer.

In eutherian mammals, the inner embryonic layer is allantoic membrane whereas in metatherian mammals, a vitelline membrane. During the early gestation the vitelline membrane in eutherians recedes quickly whereas the allantois expands (thus the name, chorioallantoic placenta).

Mammals that lack placenta belong to the group of prototherian mammals.

Word origin: Greek eu– (true) + therion (beast)

Explanation:

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Answer 2

Explanation:

All placental mammals indigenous to Europe, Africa, Asia, the Americas, Australia, and Antarctica are eutherians. Extant eutherians, their last common ancestor, and all extinct descendants of that ancestor are members of Placentalia.