NOUN
- from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms
How To Use Proterozoic eon In A Sentence
- Eukaryotic one-celled organisms became dominant in the Proterozoic Eon. Geologic time
- The apparent increase of carbonaceous macrofossils through the Proterozoic Eon is likely a result of combined biological and environmental evolution.
