Which are characteristics of the integumentary system? check all that apply. skin’s outer layer has living cells. hair regulate temperature. oil glands produce sweat and oil. nails protect nerves. hair stays on the head for two months.

Skins outer layer has dead skin cells. So this is eliminated
Hair helps regulate temperature. 
Oil glands produce oil but not sweat so this is incorrect.
Nails are for protecting from infection does not protect nerves.
Hair stays on your head for two months? Make's no sense, so this is eliminated