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What's DNA and RNA?
There's a huge variety of viruses that we know of, which is only a fraction of what's out there. Everything on the planet today is DNA based except some viruses are RNA based. The first life that arose on the planet was RNA based. And SARS-CoV-2 is an RNA virus. We can talk about why they're so successful. But you have broadly speaking viruses with RNA, genetic information, which are relics. They've adapted to the modern world and the modern organisms living in it.