| http://www.w3.org/ns/prov#value | - For example, lichens are a symbiotic relationship between a fungus and a cyanobacterium or a green alga.Stromatolites of fossilized oxygen-producing cyanobacteria have been found from 2.8 billion years ago.The ability of cyanobacteria to perform oxygenic photosynthesis is thought to have converted the early reducing atmosphere into an oxidizing one, which dramatically changed the composition of li
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