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This site tells the story of the history of the universe. Click Earlier and Later to follow the story.
Note: Many facts have been simplified to make them easier to understand.

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A complete ecosystem must have developed around this time. The blue-green bacteria and the algae were the producers. The protozoa were the consumers, and the fungi and most of the bacteria were the decomposers. They re-cycled molecules between them, with the energy of the Sun driving the whole ecosystem.  

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