Question: A certain bacterium is only found in the human throat; it can live nowhere else. It has no effect on its human host. This bacterium

A certain bacterium is only found in the human throat; it can live nowhere else. It has no effect on its human host. This bacterium is:
A symbiont but not a mutualist.
A mutualist but not a symbiont.
Both a mutualist and a symbiont.
Neither a mutualist nor a symbiont.
A certain bacterium is only found in the human

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