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The Origin of Life (The Atmosphere of Early Earth (Life on Early Earth (No…

- - - - Early forms didn't have oxygen to survive
        
        They were probably unicellular organisms
        
        They probably lived in oceans
  - - - They placed water and a mixture of the gases thought to compose Earth's early atmosphere into a flask
        
        They made sure no oxygen and unicellular organisms could get in. Then, they sent an electric current through the mixture to stimulate lightning
        
        Within a week, the mixture darkened. In the dark fluid Miller and Urey found small chemical units that if joined together, could be from proteins- one of the building blocks of life
- - - - At some point later in time some cells may have developed the ability to make their own food
        
        Autotrophs not only could make their own food but they produced oxygen as a waste product
  - - - No one will ever know for certain how and when life first appeared on Earth
        
        Scientists will continue to test their models, ask questions, and look for experimental and fossil evidence about the origin of life on Earth