The photosynthesizing cyanobacteria can be found in a wide range of environments including rivers, soils, lakes, and shallow shelves. We also note that hydrogen-based anoxygenic photosynthesis would take up H2 and CO2, thereby reducing the local concentration of gases needed to form bubbles. We collected pieces of 2.72-billion-year-old stromatolites from the pre-oxygen world by drilling into an ancient reefs in the Outback of Australia. Click to Shop ourfossils, minerals, educational materials! This was tantalizing, but we wanted more proof: a modern analog to help prove our arsenic theory. In 2014, our team found the first clue that stromatolites were produced by arsenic-assisted photosynthesis and respiration. The process of photosynthesis uses Gas-bubble entrapment has been suggested as the origin of axial porosity in the central zone of some Proterozoic stromatolites (13). This picture shows modern stromatolites (columns and mounds) in Shark The COVID crisis has cut advertising rates in half, and we need your help. Make a one-time contribution to Raw Story Investigates, or click here to become a subscriber.   Triassic, Paleozoic Era evolved yet). They needed another chemical to do this. 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