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Which is one of the body's natural barriers against pathogens? A. mucous membranes B. tears C. skin D. all of the above
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Which is one of the body's natural barriers against pathogens? A. mucous membranes B. tears C. skin D. all of the above

User MuertoExcobito
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The answer is A) Mucous membranes, and C) the skin
User Helllomatt
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the correct choice is D
User Simos Sigma
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