A body cell isn’t an individual organism like a bacterium would be. They’re dependent on the rest of the body working together. Bacteria can survive just fine solo and get all their nutrients on their own. Your individual cells can’t do that. That’s why your body has so many different systems, because different cells have different jobs but they’re all interconnected to keep the whole machine running.
So think of body cells as components while a single cell organism is a whole machine.
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