Question

question 5
the outer surface of the hair is called the:
a medulla
b root
c hair bulb
d cuticle
e shaft

Explanation:

Hair structure includes the medulla (inner core), cortex (middle layer), and cuticle (outer protective layer). The root is where hair attaches to the follicle, the hair bulb is at the base of the root, and the shaft is the visible part of the hair. Since the question asks for the outer surface, the cuticle is the correct term.

Answer:

D. cuticle