When an adolescent reaches reproductive maturity, ______ ends.

Adolescence:

1. Adolescence is the transition period when an individual undergoes physical, social, and mental changes, leading to reproductive maturity.
2. It starts around the age of 11 to 19 years, between the period of childhood and adulthood.
3. This period marks the onset of puberty.

Puberty:

1. Puberty is the time when an individual becomes capable of reproduction.
2. Therefore, when the individuals become sexually mature puberty comes to an end.

Final answer:

When an adolescent reaches reproductive maturity, puberty ends.