Biology, 01.08.2019 11:30 susannaking5742

Scientists estimate that the earth formed some 4.6 billion years ago with the first forms of life appearing around 3.5 billion years ago. these first forms of life were simple prokaryotes. later, the first photosynethic organisms resulted in more in the atmosphere. this allowed for more higher level organisms to appear on earth. a) carbon b) nitrogen c) oxygen d) sulfur

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Scientists estimate that the earth formed some 4.6 billion years ago with the first forms of life ap...