By the beginning of the _____, the placenta consists of two distinct parts including a fetal portion of chorionic villi and a maternal portion formed by the endometrium.
A)fourth week
B)eighth week
C)twelfth week
D)second week
E)first week

Question

Quizplus · Accepted Answer

By the twelfth week of gestation, the placenta has developed into two distinct parts, including a fetal portion composed of chorionic villi and a maternal part formed by the endometrium.

By the Beginning of the _____, the Placenta Consists of Two