20. Why does menstrual flow happen only once a month?
A. An egg in the ovary matures every 28 day.
B. No egg is released in the ovary.
C.An egg is not fertilized
D. The right and left ovaries release eggs at the same time.
¿¿¿???
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Answer:
A
Explanation:
i think A because An egg in the ovary matures every 28 day