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<p>knowledge is required of the chemical pathways that permit formation of the key building blocks of life under plausible <a href="page.php?w=abiogenesis">prebiotic conditions</a>.  The <a href="page.php?w=RNA_world">RNA world</a> hypothesis holds that in the <a href="page.php?w=primordial_soup">primordial soup</a> there existed free-floating <a href="page.php?w=ribonucleotide">ribonucleotide</a>s, the fundamental molecules that combine in series to form <a href="page.php?w=RNA">RNA</a>.  Complex molecules such as RNA must have emerged from relatively</p><p>
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