What is the Function of Normal Biota of the Respiratory

Question

What is the function of normal biota of the respiratory tract?
A) Competes with pathogens for resources and space
B) Microbial antagonism
C) Provides antibodies
D) Both competes with pathogens for resources and space / microbial antagonism are correct.

Accepted Answer

Options A and B describe different aspects of the same phenomenon: the normal biota competes with pathogens for resources and space (A), which is a form of microbial antagonism (B). This helps to protect the body from infections by preventing harmful microbes from establishing themselves.