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The third line of defense fights diseases by A.Providing a physical barrier against pathogens B. Attacking each pathogen it encounters in the same manner C. Producing a fever to raise the body temperature making it inhabitable to pathogens D. Producing specific and unique response for each kind of pathogen it encounters​

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It should be A because this system relies on antigens which are specific substance found in foreign microbes.
User Jess Patton
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