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Physical Barriers in First-Line Defenses: Mucous Membrane
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Physical Barriers in First-Line Defenses: Mucous Membrane
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21. The Immune System / Physical Barriers in First-Line Defenses: Mucous Membrane / Problem 2
Problem 2
Which of the following traps and contains pathogens:
A
Skin
B
Tears
C
Saliva
D
Mucus
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