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Chloroplasts also evolved from separate organisms and are now effectively organelles. So this is t a one off event.


And even if those hadn't become organelles, who knows if they (or mitocondrias) could have evolved towards multicellular life on their own? They were already organisms to begin with.


Yes! and there are additional cases, like the nitroplasts that we recently discovered. https://en.wikipedia.org/wiki/Nitroplast




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