But no one lost 50% of their own cells, so clearly if it’s alive and can be classified as a single organism. Is the gut micro biome an independent body of organisms, or is it just like any other organ of the human body, and thus would have been unaffected by the snap?
Either everyone lost almost exactly 50% of their gut biome, or, about half of all living organisms lost 100% of it, or, no one lost any part of it. Those are the only three possibilities.
The more interesting question is were viruses affected? Or did the magic stones not consider them life?