__________ include the internal and/or external sex organs that are present at birth.

A) primary sex characteristics
B) innate sex characteristics
C) secondary sex characteristics
D) hormonally determined sex characteristics

Primary sex characteristics include the physical traits that determine an individual's sex at birth, such as the presence of male or female genitalia. Innate sex characteristics could refer to any trait that is present from birth, but this term is not commonly used in discussions of sex characteristics. Secondary sex characteristics refer to physical traits that develop during puberty, such as breast development in females or facial hair growth in males. Hormonally determined sex characteristics could refer to any sex characteristic that is influenced by hormones, which includes primary, secondary, and even tertiary sex characteristics such as changes in voice pitch or fat distribution. However, primary sex characteristics specifically refer to the genitalia and reproductive organs present at birth.