SC.912.L.15.8. Conditions on early Earth. The gases thought to be on early earth were ammonia, methane, carbon dioxide, and NO oxygen.
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Her most important work was the development of the serial endosymbiotic theory (SET) of the origin of cells, which posits that eukaryotic cells (cells with nuclei) evolved from the symbiotic merger of nonnucleated bacteria that had previously existed independently. In this theory, mitochondria and chloroplasts, two major organelles of eukaryotic cells, are descendants of once free-living bacterial species.