When is the menstrual cycle not observed?

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(D) The menstrual cycle is a physiological process in human females that involves periodic shedding of the uterine lining.$1$. Before $menarche$ (the

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(D) The menstrual cycle is a physiological process in human females that involves periodic shedding of the uterine lining.$1$. Before $menarche$ (the first menstrual cycle),the reproductive system is not yet mature,so cycles do not occur.$2$. During pregnancy,the hormonal environment (high levels of progesterone) prevents the maturation of follicles and the shedding of the endometrium,thus stopping the menstrual cycle.$3$. After $menopause$ (the permanent cessation of menstruation,typically occurring between $45$ and $50$ years of age),the ovarian function declines,and the menstrual cycle ceases.Therefore,all the given conditions represent phases where the menstrual cycle is not observed.

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