The Hot Zone

Why do scientists think that RNA may have appeared on earth before DNA?

Part one

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Today, many scientists believe that RNA evolved on the Earth long before DNA did. Researchers hypothesize—obviously, no one was around to write this down—that RNA was a major participant in the chemical reactions that ultimately spawned the first signs of life on the planet. Check this out,

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http://publications.nigms.nih.gov/thenewgenetics/chapter2.htm