If you wash your skin and hair several times a day, you will soon have dry skin that easily cracks and bleeds because the oils you have removed are necessary to keep the skin supple. This oil is

A. salty sweat secreted by sweat glands.
B. lymph secreted by lymphatic ducts.
C. pili secreted by arrectors.
D. sebum secreted by sebaceous glands.
E. sebum secreted by sweat glands.


Answer: D

Biology & Microbiology

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