Multiple Choice
In the female reproductive cycle, menstrual flow occurs when the concentrations of __________.
A) estrogen and progesterone are low
B) estrogen and progesterone are high
C) estrogen is high and progesterone is low
D) progesterone is high and estrogen is low
E) estrogen and progesterone are absent
Correct Answer:

Verified
Correct Answer:
Verified
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