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Proterozoic
Prot·er·o·zo·ic [ prtərə zṓ ik ]


noun 
Definition:
 
later part of Precambrian time: the eon of geologic time, 2.5 billion to 570 million years ago, during which sea plants and animals first appeared
[Early 20th century. < Greek proteros "former" + zōē "life"]

Prot·er·o·zo·ic adjective
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