Answer :

(a) (i) Menstruation (ii) Periods

(b) Menstruation starts at the age of 12-14 years. The state at which human female attains this stage is called puberty.


(c) It is lasts usually for 3 to 5 days.


(d) Menstruation in human females signifies that the reproductive system of human female has started working.


(e) Menstruation stops temporarily at the beginning of pregnancy.


(f) Menstruation stops permanently at the age of 45-50.


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