How Earth’s earliest life overcame a genetic paradox "On ancient Earth, the earliest life encountered a paradox. Scientists know that eventually, these RNA chains must have become longer and longer, setting the stage for the evolution of complex life forms like amoebas, worms, and eventually humans....
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On ancient Earth, the earliest life encountered a paradox. Chains of RNA—the ancestor of DNA—were floating around, haphazardly duplicating themselves. Scientists know that eventually, these RNA chains must have become longer and longer, setting the stage for the evolution of complex life forms like amoebas, worms, and eventually humans. But under all current models, shorter RNA molecules, having less material to copy, would have reproduced faster, favoring the evolution of primitive organisms over complex ones.
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