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Well I'm not sure but I'll give the explanation which I think is correct. Antibodies are used to fight against invading pathogens in the body. The antibodies are produced by white blood cells (Lymphocytes). Due to the fact that there are a multitude of viruses - which can mutate with time - and that antibodies are only effective against one type of pathogen, then the body produces a variety of antibodies to fight each pathogen.

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16y ago

What else can I help you with?