Discussion
An appropriate term for human resident flora is :
Answer: A
The resident flora are commensals.
The normal microbiota of the skin, mouth, gut and other surfaces live on the host and gain food and shelter without, as a rule, harming it, which is the definition of commensalism. They also protect the host by competing with pathogens, so some textbooks describe parts of the relationship as mutualistic, but 'commensals' is the standard term for the normal flora.
Parasites and pathogens harm the host, which normal flora do not under ordinary conditions. Mutualism implies a clear benefit to both partners, which is true only of certain members of the flora.
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