Which Statement About Placental Mammals Is True

Multiple Choice

Which statement about placental mammals is true?

A) A moderate amount of yolk supports the embryo prior to implantation.
B) As the blastocyst reaches the uterus, it hatches from the trophoblast.
C) The blastocyst produces the body of the embryo, and the maternal tissues produce the entire placenta.
D) The zona pellucida promotes early implantation.
E) Chorionic villi develop from the trophoblast and increase the embryo's area of contact with the maternal circulatory system.