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OpenStudy (anonymous):
Which is NOT a part of the immune system? A. Skin B.Stomach Acid C.Mucus D.Fingernails
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OpenStudy (anonymous):
The answer is D, fingernails are not part of the immune system. Though fingernails do protect, they don't fight back when outside sources are compromising our immune system, like skin, stomach acid, and mucus all do.
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