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Secondary sexual characteristics are the physical signs of sexual maturation that are not directly involved in reproduction. These characteristics develop during puberty and include the development of breasts and hips in females, and the growth of facial hair and a deepening voice in males.

Secondary Sexual Characteristics

Adrenarche refers to a type of secondary sexual characteristic where the adrenal glands mature. 

Adrenarche

During puberty, a number of physical changes occur that signal sexual maturation. Which of the following changes is a sign of this maturation but is NOT directly involved in the biological process of reproduction?

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