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The geological time scale is a chronological framework that represents the history of the Earth and life based on stratigraphic, paleontological, and radiometric evidence. It is divided into eons, eras, periods, and epochs, each marked by characteristic biological events. The earliest eon, Archean, witnessed the origin of life in the form of simple prokaryotic organisms such as ________ _____ ________ __________ __________ ___ _______ ______.
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