 proterozoic_eon |
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| 1. | [ noun ] (geology) from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms | |
| Synonyms: | Preoterozoic_era proterozoic_aeon Proterozoic | |
| Related terms: | eon era Precambrian | |
| Similar spelling: |
proterozoic_aeon Preoterozoic_era |
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