Twelve-year-old Teetham spent the whole summer at camp.When he returned home,his parents were surprised that he was taller,more muscular,and that his voice had deepened.These physical changes are examples of which of the following?

A) puberty
B) primary sex characteristics
C) egocentrism
D) secondary sex characteristics

Secondary Sex Characteristics

Features that distinguish the two sexes from each other but are not directly involved in reproduction, such as breast development in females and facial hair in males.

Puberty

The developmental stage during which children mature sexually and physically, becoming capable of reproduction.

Muscular

Relating to or affecting the muscles or the physical strength and power provided by muscles.