proterozoic : Idioms & Phrases
proterozoic aeon
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noun from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms
Proterozoic aeon; Proterozoic.
WordNet
proterozoic eon
-
noun from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms
Proterozoic aeon; Proterozoic.