21. Which of the following statement best explains what a menstrual cycle is?
A. It is the discharge of blood from the vagina.
B. It is the discharge of blood from the ovary.
C. It is the discharge of blood from the fallopian tubes.
D. It is a monthly series of hormonal changes leading to egg maturation and uterine preparation for a possible pregnancy.
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Answer:
D. po
Explanation: