Placental mammals nourish developing embryos with the maternal circulation and the placenta. Because of this, they have _______ than animals that develop within shelled eggs.

Question

Quizplus · Accepted Answer

Placental mammals rely on the maternal circulation and the placenta for nourishment, so they have less yolk than animals that develop within shelled eggs. Shelled eggs contain a larger amount of yolk which serves as the primary source of nutrients for the developing embryo.

Placental Mammals Nourish Developing Embryos with the Maternal Circulation and the Placenta