Cyanobacteria use water, carbon dioxide, and sunlight to create their food, and expel oxygen as a by-product. The real significance of stromatolites is that they are the earliest fossil evidence of life on Earth. ... They were the first known organisms to photosynthesis and produce free oxygen.
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Vincent Van Gogh. Hope I helped! ☺
Greek warships<span> had oars as well as sails</span>
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George Washington signs Jay Treaty with Britain. On August 18, 1795, President George Washington signs the Jay (or “Jay's”) Treaty with Great Britain.
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