<Tr> <Td> 4280 Ma </Td> <Td> Earliest possible appearance of life on Earth . </Td> </Tr> <P> 4000 Ma--2500 Ma </P> <Table> <Tr> <Th> Date </Th> <Th> Event </Th> </Tr> <Tr> <Td> 4000 Ma </Td> <Td> Formation of a greenstone belt of the Acasta Gneiss of the Slave craton in Northwest Territories, Canada, the oldest rock belt in the world . </Td> </Tr> <Tr> <Td> 4100--3800 Ma </Td> <Td> Late Heavy Bombardment (LHB): extended barrage of impact events upon the inner planets by meteoroids . Thermal flux from widespread hydrothermal activity during the LHB may have been conducive to abiogenesis and life's early diversification . "Remains of biotic life" were found in 4.1 billion - year - old rocks in Western Australia . According to one of the researchers, "If life arose relatively quickly on Earth...then it could be common in the universe ." This is when life most likely arose . </Td> </Tr> <Tr> <Td> 3900--2500 Ma </Td> <Td> Cells resembling prokaryotes appear . These first organisms are chemoautotrophs: they use carbon dioxide as a carbon source and oxidize inorganic materials to extract energy . Later, prokaryotes evolve glycolysis, a set of chemical reactions that free the energy of organic molecules such as glucose and store it in the chemical bonds of ATP . Glycolysis (and ATP) continue to be used in almost all organisms, unchanged, to this day . </Td> </Tr> <Tr> <Td> 3800 Ma </Td> <Td> Formation of a greenstone belt of the Isua complex of the western Greenland region, whose rocks show an isotope frequency suggestive of the presence of life . The earliest evidences for life on Earth are 3.8 billion - year - old biogenic hematite in a banded iron formation of the Nuvvuagittuq Greenstone Belt in Canada, graphite in 3.7 billion - year - old metasedimentary rocks discovered in western Greenland and microbial mat fossils found in 3.48 billion - year - old sandstone discovered in Western Australia . </Td> </Tr> <Tr> <Td> 3500 Ma </Td> <Td> Lifetime of the last universal common ancestor (LUCA); the split between bacteria and archaea occurs . <P> Bacteria develop primitive forms of photosynthesis which at first did not produce oxygen . These organisms generated Adenosine triphosphate by exploiting a proton gradient, a mechanism still used in virtually all organisms . </P> </Td> </Tr> <Tr> <Td> 3200 Ma </Td> <Td> Diversification and expansion of acritarchs . </Td> </Tr> <Tr> <Td> 3000 Ma </Td> <Td> Photosynthesizing cyanobacteria evolved; they used water as a reducing agent, thereby producing oxygen as a waste product . The oxygen initially oxidizes dissolved iron in the oceans, creating iron ore . The oxygen concentration in the atmosphere slowly rose, acting as a poison for many bacteria and eventually triggering the Great Oxygenation Event . The Moon, still very close to Earth, caused tides 1,000 feet (305 m) high . The Earth was continually wracked by hurricane - force winds . These extreme mixing influences are thought to have stimulated evolutionary processes . </Td> </Tr> <Tr> <Td> 2800 Ma </Td> <Td> Oldest evidence for microbial life on land in the form of organic matter - rich paleosols, ephemeral ponds and alluvial sequences, some of them bearing microfossils . </Td> </Tr> </Table> <Tr> <Th> Date </Th> <Th> Event </Th> </Tr>

When did atp first appear on planet earth
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