Tears and mucus membranes would be a part of which defense system?

Tears and mucus membranes would be a part of which defense system?

The Correct Answer is

innate external defenses (surface barriers) are the first line of defense and include tears, mucus membranes, and the skin.

Reason Explained

innate external defenses (surface barriers) are the first line of defense and include tears, mucus membranes, and the skin. is correct for Tears and mucus membranes would be a part of which defense system?

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