Gradual thinning and graying of the hair occurs naturally with age. Thinning is caused by , whereas graying is caused by .
a. destruction of the germ centers that produce hair follicles; cessation of pigment production
b. cessation of pigment production; destruction of the germ centers that produce hair follicles
c. decrease in epidermal cells; changes in collagen content
d. changes in collagen content; decrease in epidermal cells
Question 2
Most facial wrinkling experienced by adults is
a. inevitable. b. genetic.
c. caused by an overuse of vitamin E.
d. preventable if one limits exposure to the sun's ultraviolet rays and doesn't smoke.
The hair cycle
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