During adolescence teenagers experience a new section called puberty. This is when the brain releases chemicals called hormones. During puberty many days fife rent things can happen throughout your body for example, both female and males will experience a growth spurt. Also females will experience growth of armpit hair and pubic hair, where as males experience their voise box grows so the voice deepens, both these examples are secondary sexual characteristics. Primary sexual characteristics are present at birth so for males teste enlarge and produce sperm and so females uterus and vagina grows. Secondary characteristics appear during puberty.
Male sexual characteristics. Female sexual characteristics.