a) Mentruastion in Sciencetific Terms.
Periods in Everyday Language.
b) Well, yea Sad. It's an Awful Period in Life, I mean, There are Certain Restriction That Needs to be Followed during that time. it's not easy..
c) "Sexual Maturity" in Human Female Body.
d) During Pregnancy it stops Temporarily and Continues after That.
e) Menopause is the name Given For the Event to stop Permanently. usually at the age of 40-45.
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This Particular Event is Common in all Females, we undergo this Stage at 10-12.