Biologically,the last phase of the menstrual cycle is

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Menstruation is the last phase of the menstrual cycle, during which the endometrium (lining of the uterus) sheds and is expelled from the body along with blood and other materials. This occurs if fertilization and implantation of a fertilized egg do not occur, marking the end of the reproductive cycle for that cycle. Ovulation occurs earlier in the cycle, and both proliferation and follicle-stimulation refer to earlier stages of the cycle as well.

Biologically,the Last Phase of the Menstrual Cycle Is