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Health, 08.11.2019 22:31 andrew763

The body’s natural defense against pathogens includes skin, tears, saliva,

mucous membranes, and the respiratory system

mucous membranes, and the digestive system

the lungs, and digestive system

and the digestive and respiratory systems

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The body’s natural defense against pathogens includes skin, tears, saliva,

mucous memb...

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