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(C) In human females,the onset of the reproductive phase is marked by the beginning of the menstrual cycle,which is known as menarche.This process inv

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menstruation

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(C) In human females,the onset of the reproductive phase is marked by the beginning of the menstrual cycle,which is known as menarche.This process involves the periodic shedding of the uterine lining and is a clear indicator that the female reproductive system has become functional.While body growth,changes in hair pattern,and voice changes are secondary sexual characteristics that occur during puberty,they do not specifically mark the onset of the reproductive phase as clearly as the first menstruation.

In human females,an event that reflects the onset of the reproductive phase is

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