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.
E
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What is the general trend in diversity in vascular plants for the past 145 million years?
What will be an ideal response?