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
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