You could ask who’s in charge: Lots of people think, well, we’re humans; we’re the most intelligent and accomplished species - we’re in charge. But bacteria may have a different outlook: more bacteria live and work in one linear centimeter of your lower colon than the number of all the humans who have ever lived. That’s what’s going on in your digestive tract right now. Are we in charge, or are we simply hosts for bacteria? It all depends on your outlook.
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