Trophoblast Activity After Blastocyst Attachment
Which of the following actions do trophoblasts perform after the blastocyst attaches to the uterine wall?
A
They encounter and surround maternal blood vessels.
B
They form the chorionic villi.
C
They perform all of these actions.
D
They proliferate rapidly.
E
They invade deeper into the uterine wall.
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