Eutherians include a diversity of forms which are believed to have originated from a common ancestor which was
A) a monotreme.
B) a small insectivorous mammal.
C) paleognathae.
D) Homo erectus.
E) an amphibian.

Question

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Eutherians, or placental mammals, are believed to have originated from a common ancestor that was a small insectivorous mammal. This group includes a wide diversity of mammals that share a common mode of reproduction where the fetus is carried in the uterus until a late stage of development.

Eutherians Include a Diversity of Forms Which Are Believed to Have