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The role of clays. Chemists studying possible mechanisms for the origin of life have emphasized the likely role of clays in providing a suitable environment for the necessary reactions. Experiments with various clay solutions demonstrate the validity of this system as a model for the synthesis of polymers essential for life under conditions simulating the primordial ocean environment. |
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Down through the ages. This geologic "clock" diagram summarizes the history of life on Earth and its relation to the geologic eras. (After Prof. J.W.Schopf, UCLA.) |