Question

9 what do sebaceous glands secrete? a keratin b sebum c collagen d sweat

Explanation:

Sebaceous glands are oil - producing glands in the skin, and they secrete sebum which helps to lubricate the skin and hair. Keratin is a protein in hair, nails and the outer layer of skin. Collagen is a structural protein in connective tissues. Sweat is secreted by sweat glands.

Answer:

B. sebum