The skin, tears, and stomach acid are part of the body's first line of defense against infection. How do scientists classify these defenses?
A. as specific defenses, because they respond to specific physical or chemical properties of pathogens
B. as weak defenses, because they stop only a small percentage of pathogens that threaten the body
C. as nonspecific defenses, because they bar or stop infections without discriminating pathogens from other agents
D. as barrier defenses, because they act like a wall to stop pathogens from invading
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