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Octavus t1_izd243f wrote

Reply to comment by bruceleroy99 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

There are also viroids which are even simpler than viruses. They are simply a circular strand of RNA, that is it. However they are still able to infect plants, use their cellular machinery to create more copies, and spread.

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