Answer the following question given this paragraph: 

Head hair protects the scalp from ultraviolet light exposure and loss of body heat. Hair in eyelashes, eyebrows, and nostrils traps water, dust, and other irritants. Nails protect the ends of fingers and toes and enhance the sense of touch.


Q: What protects the scalp from ultraviolet light exposure and loss of body heat?


A:
head hair