When and how did life originate on earth?
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about 3.8 billion years old on earth life was existed Earth's atmosphere consisted of hydrogen compounds—methane, ammonia and water vapour—and that life began under such reducing conditions, which are conducive to the formation of organic molecules. hence the first living organism cyanobacteria(belongs to blue green algae species) was originated
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Life appeared on earth 2000 million years back..
Life had come from pre existing organic molecules and reactions btwn them..
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