The menstrual flow is the result of

a. no implantation of a zygote.
b. decreased levels of progesterone.
c. discarded uterine lining.
d. no implantation of a zygote and discarded
uterine lining.
e. no implantation of a zygote, decreased levels of
progesterone, and discarded uterine lining.


Answer: e

Biology & Microbiology

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