Geologic eon that occurred from 570 to 2500 million years ago During this time period, the first single-celled and multi-celled eukaryotic organisms evolved and developed
The final era of the Precambrian, spanning the time between 2 5 billion and 544 million years ago Fossils of both primitive single celled and more advanced multicellular organisms begin to appear in abundance in rocks from this era Its name means "early life "
Formed in the later of two divisions of the Precambrian era; from 600 million to 1 5 billion years ago; bacteria and fungi; primitive multicellular organism
from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms formed in the later of two divisions of the Precambrian era; "proterozoic life forms