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The Origin of Life (The Atmosphere of Early Earth (Life on Early Earth…

- - - - Did not nee oxygen
      - probably unicellular
      - lived in the ocean
  - - - Placed water and a mixture of gases thought to compose Earth's early atmosphere into a flask
        
        They sent an electric current through the mixture to stimulate lightning
        
        Within a week the mixture darkened. There was a chemical unit that, if joined together, could form protein
- - - - Eventually, some of these large chemicals joined together and became the forerunners of the first cells
  - - - A trace of an ancient organism that has been preserved in rock or another substance