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The Proterozoic is a geological eon representing the time just before the proliferation of complex life on Earth. The name Proterozoic comes from Greek and means "earlier life",the Greek root protero-,means "former, earlier" and zoic-,means "animal, living being". The Proterozoic Eon extended from 7016788940000000000?2500 Ma to 7016171042192000000?542.0±1.0 Ma , and is the most recent part of the Precambrian. It is subdivided into three geologic eras : the Paleoproterozoic, Mesoproterozoic, and Neoproterozoic.