Final answer:Duringpregnancy, the period stops because the fertilized egg implants into the uterus lining, and the pregnancy hormones prevent the shedding of the uterine lining.Menstrual cyclesstop completely after menopause when the ovaries no longer produce eggs.Explanation:During pregnancy, theperiodstops because when the egg is fertilized, it implants into the thick lining of the uterus, and this stops the monthly cycle. The pregnancy hormones, such asestrogenand progesterone, help maintain the pregnancy and prevent the shedding of the uterine lining. As a result, menstruation does not occur until after thepregnancyis over.After menopause, which typically occurs in a woman's early fifties,menstrual cyclesstop completely because the ovaries no longer produce eggs.Learn more aboutmenstrual cyclehere:brainly.com/question/35901418#SPJ11...

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