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Adolescence involves internal changes related to reproductive capability.
The onset of menstrual cycle is an important internal change.
The menstrual cycle usually repeats after 28–30 days.
Healthy menstrual cycles may range from 21–35 days.
Blood discharge during the menstrual cycle is called menstruation.
Menstruation generally lasts for 3–7 days.
28 – 4 = 24 days.
Menstruation is a natural biological process.
Some girls may feel pain in the lower abdomen.
Menstruation usually ends between 45–55 years of age.
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