Question

which of the following pairs is not matched correctly?
a hair—composed of keratin
b nails—grow longer from the root
c sweat glands—secrete sebum to cool the skin
d sebaceous glands—secrete into hair follicle

Explanation:

Hair is made of keratin. Nails grow from the root. Sebaceous glands secrete sebum into hair follicles. Sweat glands secrete sweat to cool the skin, not sebum.

Answer:

C. sweat glands—secrete sebum to cool the skin