pathogen are the things that cause illness and there are pathogens everywhere and your body has three different defenses to stop them from causing illness.
your skin is your first defense because it mostly stops bacteria from getting in you body
What is your first line of defense to stop pathogens from causing illness?
if pathogens was to get in your body it would get through by the respiratory and digestive system but you have mucus and stomach acid as another first defense to get rid of the pathogen but also mucus in your nose and stomach trap pathogen that are in your body
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