What is the function of normal biota of the respiratory tract?
A) Compete with pathogens for resources and space
B) Microbial antagonism
C) Provide antibodies
D) Both compete with pathogens for resources and space and microbial antagonism are correct.
E) Compete with pathogens for resources and space,microbial antagonism,and provide antibodies are all correct.
Correct Answer:
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