In 1953 SL Miller created primitive earth conditions in the laboratory and gave experimental evidence for origin of first form of life from pre-existing non-living organic molecules. The primitive earth conditions created include 

1. low temperature, volcanic storms, atmosphere rich in oxygen 
2. low temperature, volcanic storms, reducing atmosphere
3. high temperature , volcanic storms, non-reducing atmosphere
4. high temperature , volcanic storms, reducing atmosphere containing CH4, NH3 etc.

Subtopic:  Urey & Miller Experiment |
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