Labels:ball | comic book | hakham | person | pole | sky | tree | tribute album OCR: STRANDS OF RNA (branch -llke lines) are being synthesized on DNA (vertical line) Today genetic information usually flows from DNA to RNA, but many investigators think some form of RNA evolved before DNA This idea is central to the RNA -world theory of how life began which holds that RNA made possible the evolution of DNA and life itself. Repeated generation after generation natural selection could thus lead to the evolution of complex organisms from simple ones The theory therefore implied that all current life forms have evolved from single simple progenitor an organism now referred to as life's last common ancestor (This life form is said to be "last" not "first" because 11 is the nearest shared ancestor of all contemporary organisms; more distant ancestors must have appeared earlier.) D ...
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