The placenta
a. forms from endometrial and extraembryonic
tissues.
b. will cover about one-fourth of the inner uterine
surface at full term.
c. does not normally intermingle fetal blood with
maternal blood.
d. secretes progesterone and estrogens that
maintain the uterine lining during the second and
third trimesters.
e. does all of these.
Answer: e
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