contestada

5. When are blackheads formed?
A. when sebaceous glands become clogged
B. when grooves in the epidermis gather dirt
C when hair follicles grow inward rather than
outward
D. when there is an excess of keratin produced

Respuesta :

I think the answer is A
Jazz1978
The answer is A - it happens when the opening of the hair follicles becomes clogged with dead skin, dirt and oils. Each of these follicles contains a sebaceous gland (which produces sebum). Eventually after this opening has collected all of the dirt, oil etc it will form a blackhead.

Otras preguntas