Proterozoic
from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms • Syn: Proterozoic eon, Proterozoic aeon • Derivationally related forms: proterozoic • Instance Hypernyms: eon, aeon • Part Holonyms: Precambrian, Precambrian eon, Precambrian aeon, Precambrian period
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