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History of the Earth and Evolution
Formation of the solar system- 4.6 billion years ago
Formation of the Earth- 4.5 billion years ago
Oldest known cellular fossils- 3.5 billion years old
Age of microfossils resembling cyanobacteria found in Australia- 2.7 billion years old
Oxygen reached today's levels- 2.2 billion years ago
Prokaryotes entered and began to live in larger prokaryotes- 1.5 billion years ago
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