BILL SANDERSON / SCIENCE PHOTO LIBRARY BILL SANDERSON / SCIENCE PHOTO LIBRARY
Primordial soup. Conceptual image of a bowl of soup containing the letters U, A, G and C, representing the RNA World Hypothesis. Advocates of this theory believe that RNA (Ribonucleic acid) was the first life on earth. RNA is capable of storing, transmitting and duplicating genetic information, and it can also act as an enzyme and reproduce by itself.
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