Which type of hair is typically found on a fetus?

The correct choice, lanugo, refers specifically to the fine, soft hair that covers the body of a developing fetus. This type of hair is typically present around the 20th week of gestation and plays a significant role in regulating body temperature before birth. Lanugo is usually shed before or shortly after birth, making way for the more permanent types of hair, such as vellus and terminal hair, which develop later in life.

Vellus hair, while also fine and soft, is the type of hair that replaces lanugo after birth and is found on most of the human body, providing a layer of warmth and protection. Terminal hair is coarser and thicker, typically developing after puberty in certain areas of the body, such as the scalp, armpits, and pubic region. The term "fuzzy" does not correspond to a recognized category of hair and is not used in a medical or anatomical context.

Overall, understanding the distinct characteristics and developmental stages associated with different types of hair helps clarify why lanugo is the correct answer.