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Which are correct examples of physical (P), chemical (C), and biological (B) barriers?

P: complement system; C: saliva; B: coughing
P: coughing; C: saliva; B: complement system
P: coughing; C: sneezing; B: complement system
P: complement system; C: saliva; B: sneezing

1 answer

The correct examples are:
P: complement system; C: saliva; B: coughing