How is adolescence different from childhood?

Childhood: is defined as period of child. It is the time that covers from the birth to adolescence.

Adolescence

This is the complex stage of life because childern grow/move from childhood to adolescence. It is the period of the reproductive maturity and period of confusion and transition.

Adolescence starts from the age of 13 years and ends at the age of 19 years.

During adolescence changes occur in external and internal parts of the body.