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Our understanding of pre-biotic chemistry (spontaneous hydrolysis as one example) makes RNA replication virtually impossible.
But the greatest piece of evidence against the RNA world theory's credibility is its inability to be realized and observed, even under intelligent direction using precise laboratory controls.
You're much too pessimistic about this field, our *CURRENT* understanding of pre-biotic chemistry does have some major roadblocks ahead like joining nucleotides and RNA to DNA synthesis and the fact that with our current information scientists can't solve these dilemmas does not mean they will never be solved. So what do you believe? Do you believe that simple chemicals can eventually form nucleotides then require super-intelligent assistance to get to DNA?