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The origin of life (The Atmosphere of Early Earth (Modeling conditions on…

- - - - The first life forms were probably unicellular organisms that lived in the oceans
        
        The first organisms probably resemble the archaea that live in extreme environments
  - - - They placed water and a mixture of gases thought to compose Earth's early atmosphere in a flask, making sure to keep oxygen and unicellular organisms out
        
        The sent an electric current through the mixture
        
        Within a week small chemical units that could form proteins were found
- - - - As they reproduced their numbers increased, and so the number of chemicals available to them decreased
        
        Over the years cells developed the ability to make their own food, and produce oxygen