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mcr1974 t1_izc29sd wrote

Reply to comment by clocks212 in Have living things always had an immune system? How did they survive / evolve to deal with diseases, and how does that compare to modern immune systems? by bruceleroy99

but what would have viruses attacked?

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the_quark t1_izc59cy wrote

They might have started simply as self-replicating sets of chemicals in the early ocean. At this point though we've only been able to speculate about their (and life's) ultimate direct origin.

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