Choose all the answers that apply. Skin _____. is a surface barrier to infection, secretes acidic chemicals that can destroy microorganisms, is part of the integumentary system, is the first line of defense against infection, secretes mucus that traps foreign substances
*is the first line of defense against infection, *is part of the integumentary system, *secretes acidic chemicals that can destroy microorganisms & *is a surface barrier to infection