Examlex
Which of the following has the highest percent of oxygen?
Amenorrhea
The absence of menstruation - one or more missed menstrual periods.
Dysmenorrhea
Painful menstruation, which may involve cramps in the pelvic area.
Endometriosis
A painful, chronic condition where tissue similar to the lining inside of the uterus grows outside the uterus, leading to pain and infertility.
Menarche
The occurrence of the first menstrual cycle in adolescent females, a key event in female puberty.
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