| http://www.w3.org/ns/prov#value | - ???in the 1870s and 1880s scientists assumed that devising an explanation for the origin of life would be fairly easy???.they assumed that life was essentially a rather simple substance called protoplasm that could be easily constructed by combining and recombining simple chemicals such as carbon dioxide, oxygen, and nitrogen. ???just as salt could be produced spontaneously by adding sodium to chl
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