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

- - - - "First, early life forms did not need oxygen to survive. Second, they were probably uni-cellular organisms. Thirdly, they probably lived in the oceans."
        
        The first life forms probably looked like archaea that today, live in extreme environments such as in the bottoms of oceans, hot springs or polar ice caps.
  - - - Stanley Miller and his advisor made an experiment which they recreated the conditions of Early Earth in their labratory.
        
        "They placed water (to represent the ocean) and a mixture of gasses through to compose Earth's early atmosphere into a flask. They were careful to keep oxygen and unicellular organisms out of the mixture. They sent an electric current through this mixture to stimulate lightning."
        
        In a week, the mixture they had made had darkened. In the dark fluid, Miller and Urea (his advisor) discovered some small chemical units that joined together and could form proteins. - one of the building blocks of life.
- - - - When the cells grew, they reproduced, their numbers increased, and the amount of chemicals available to them decreased.
        
        At a point much later, the cells may have developed the ability to make their own food and become autotrophes. "These early ancestors of today's autotrophes had an important effect on the atmosphere. "
        
        When they made their food, they made oxygen as a waste product.
        
        The autotrophes thrived, oxygen built up in the Earth's atmosphere. "Over hundreds of millions of years, the amount of oxygen increased to its current level."
  - - - No one will ever know how life first appeared on Earth