this occurs when fertilization does not take place.The uterine lining begins to break down and bleeding results.menstrual fluid contains blood cells amd mucus flow and lasts from 3 to 7 days. brainly nonse-report
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What phase is the uterine lining begin to break down and bleeding results?
When the follicular phase begins, levels of estrogen and progesterone are low. As a result, the top layers of the thickened lining of the uterus (endometrium) break down and are shed, and menstrual bleeding occurs.
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