Relating to the earliest periods of Earth's history when life first began to develop and exist, particularly the Archean eon.
From Greek 'archi-' (primitive, first) and 'zoic' (relating to life), combining elements meaning 'first' and 'life' to describe Earth's most ancient biological era.
The Archeozoic eon wasn't lifeless—it saw the first single-celled organisms and cyanobacteria that would eventually create Earth's oxygen atmosphere, making tiny archeozoic microbes the most revolutionary life forms ever.
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