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Terrestrial Origins and Evolution
The fossils discovered in Australia date back to 3.5 billion years ago –“ and age
known as the Archaean. The atmosphere at this time in Earth´ history was very
different than today. It was likely composed of methane, ammonia and other gases
toxic to most life that lives on our planet now. It is thought that life first
started appearing on Earth during the Early Archaean.
Credit: UC Berkeley
01/14/09

 



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