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Direction: Read the following and answer the questions from given below

The average length of the menstrual cycle is 28-29 days, but this can vary between woman and from one cycle to the next. The menstrual cycle is controlled by many different glands and the hormones that these glands produce. The menstrual cycle is a biofeedback system, which means each structure and gland is affected by the activity of the others menstruation is the elimination of the thickened lining of the uterus from the body through vagina, menstrual fluid contains blood, cells from the lining of the uterus and mucus.

The average length of a period is between three days and one week. The four phases of the menstrual cycle include menstruation, the follicular phase, ovulation and the luteal phase.

(iv) The area that experiences the greatest change during menstrual cycle is

A) vagina              

B) perimetrium

C) cervix               

D) endometrium