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uysha [10]
3 years ago
8

Which is NOT a part of the immune system? a.skin b.stomach acid c.mucus d.fingernails

Biology
1 answer:
poizon [28]3 years ago
3 0
Immune system is a network composed of cells, tissues, and organs that work together so that the body may be protected from harm. Skin, stomach acid, and mucus all perform to protect the body. The fingernails, being outgrowth of skin, do not perform that much. Thus, the answer is letter D. 
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