1. Name an antibody in our body. 2.What body system do antibodies work in?

Please help i will mark

 IgG

Explanation: For example, IgG, the most common antibody, is present mostly in the blood and tissue fluids, while IgA is found in the mucous membranes lining the respiratory and gastrointestinal tracts. The five main classes of antibodies (immunoglobulins): IgG, IgA, IgD, IgE, and IgM.

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