Q: Answer the following question given this paragraph: Therian mammals are viviparous. They give birth to an embryo or infant rather than laying eggs. The female reproductive system of a therian mammal includes a uterus and a vagina. There are two groups of therian mammals: placental mammals and marsupials. Q: What are the two groups of therian mammals? A:

[A]. felines and canines
[B]. monotremes and mollusks
[C]. dolphins and whales
[D]. placental mammals and marsupials
A:
[D].