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- W996984395 abstract "Publisher Summary The oldest strong evidence for life on the Earth is from rocks about 3.5 Ga old, by the time complex oxygenic photosynthesis had already evolved. There is possible evidence for photosynthetic life in rocks from Isua, Greenland, and life may have existed on the Earth as early as 4 Ga ago. Heavy meteorite bombardment is likely to have boiled the oceans and it is unlikely that any life could have survived with the possible exception of hyperthermophile organisms living deep in hydrothermal systems. The Earth around 4Ga ago, at the close of the Hadean, probably had deep oceans. Loss of hydrogen to space may have supplied minor oxidation power to the air or water system, which was slightly oxidizing and enough to supply sulfate for reduction by bacteria. The last common ancestor of all cells may date from around this time. It may have been a hyperthermophile. However, it is unclear whether the first common ancestor lived in high temperature water. Frequent large meteorite impacts may have caused brief but catastrophic events of raised seawater temperature, and it is possible that only a hyperthermophile last common ancestor survived. Photosynthesis may have evolved in stages, possibly as an adaptation of thermotaxis around hydrothermal vents." @default.
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- W996984395 date "2003-01-01" @default.
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- W996984395 title "The physical setting for early life" @default.
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