What are the two main functions of the immune system?!

Question: What are the two main functions of the immune system!?
Answers:

Keep you healthy, and keep you not sick!.

Deep, I know!.Www@Answer-Health@Com

Lymph nodes have two main functions:!. phagocytic cells act as filters for particulate matter and micro-organisms;Www@Answer-Health@Com

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What are the two main functions of the immune system?!

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