3) 2) 1) i think this is the right answer but c looks correct too\
Answer:The immune system is a network of cells, tissues and organs that work together to attack pathogens that try to invade your body. Bacteria, parasites and fungi that may cause infection meet a system of immune soldiers, including T-lymphocytes, macrophages and neutrophils.
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Answer:
Severe deficiency, called pellagra, can cause symptoms related to the skin, digestive system, and nervous system.
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