Under atmospheric conditions approximating those that probably existed on earth 4.5 billion years ago, scientists have duplicated the creation of many of the basic chemical building blocks of life. But one compound essential to the continuance of life has never been found in the primeval atmosphere of the laboratory: chlorophyll, which enables plants to use the energy of sunlight to convert carbon dioxide and water into the food that plants and animals need. Now the missing compound may well have been created, further encouraging scientists to believe that they are on the right track toward understanding how...
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