Which of the following describes a secondary sexual characteristic?

A secondary sexual characteristic refers to traits that develop during puberty and are not directly related to the reproductive organs themselves but are influenced by sex hormones. Facial hair in males exemplifies a secondary sexual characteristic, as it appears as a result of increased testosterone levels during puberty. These characteristics help differentiate between male and female physical traits and often play a role in sexual attraction and maturity.

In contrast, the development of ovaries and the formation of the uterus are primary sexual characteristics, as they are directly involved in reproduction and are present at birth. Estrogen production is related to the hormonal environment and function of reproductive organs but does not represent a physical trait that differentiates males from females during puberty.