In the human body, which of the following is considered an external defense in the prevention of disease? Mucous O Histamines O Antibodies O Fever

I believe it would be Mucous

Explanation:

Since Histamines and Antibodies are chemicals that are inside a human body they are not an external defense. Also, a fever can only happen if the disease gets inside the body, thus its not an external defense. All this leaves only one option out and that is Mucous.

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