The menstrual cycle is caused by _____. A. the embryo leaving the uterus. B. the endometrium lining leaving the uterus. C. the embryo staying in the uterus. D. the lack of a healthy pregnancy during ovulation.

The menstrual cycle is caused by _____.

A. the embryo leaving the uterus.

B. the endometrium lining leaving the uterus.

C. the embryo staying in the uterus.

D. the lack of a healthy pregnancy during ovulation.

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The menstrual cycle is caused by _____. A. the embryo leaving the uterus. B. the endometrium lining leaving the uterus. C. the embryo staying in the uterus. D. the lack of a hea…

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