Question

what is secreted by the highlighted structure?
sweat
cerumin
mucus
sebum

Explanation:

Sweat is secreted by sweat - glands. Cerumin is secreted by ceruminous glands in the ear. Mucus is secreted by mucous - membranes. Sebum is secreted by sebaceous glands in the skin. Without seeing the highlighted structure, we assume common knowledge about skin - related secretions. Sebaceous glands are common in skin diagrams and secrete sebum to lubricate the skin and hair.

Answer:

sebum