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(C) The onset of the reproductive phase in human females is marked by the beginning of the menstrual cycle,known as menarche.This process involves the

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Menstruation

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(C) The onset of the reproductive phase in human females is marked by the beginning of the menstrual cycle,known as menarche.This process involves the periodic shedding of the uterine lining and is a clear biological indicator that the female reproductive system has become functional and capable of reproduction.While body growth,changes in hair pattern,and voice changes are secondary sexual characteristics that occur during puberty,they are not the primary indicators of the onset of the reproductive phase itself.

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

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