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45,000 BCE
primordial soup (creation of life before everything else)
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35,000 BCE
The oldest known fossils are prokaryotic (3.5 billion years old)
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20,000 BCE
The oldest unicellular eukaryotic fossils (2 billion years old)
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16,000 BCE
The oldest multicellular eukaryotic fossils(1.6 billion years old)
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540 BCE
The oldest known animal fossils (570-540 million years old)
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The creation of the Primordial soup theory
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discovery of ribozymes