അർത്ഥം : From 2,500 to 544 million years ago. Bacteria and fungi. Primitive multicellular organisms.
പര്യായപദങ്ങൾ : proterozoic aeon, proterozoic eon
അർത്ഥം : Formed in the later of two divisions of the Precambrian era.
ഉദാഹരണം :
Proterozoic life forms.