7. How often do girls normally experience menstruation?
a. once every 30 days
c. once every 29 days .
b. once every 28 days
d. once every 25 days
a. once every 30 days
c. once every 29 days .
b. once every 28 days
d. once every 25 days
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Letter A-Once every 30 days.
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