Geochronological Scale Part 2 76846547

Tags: table cell scale education science history geology training unit research evolution international microorganism era bacteria algae period ranks rank chronology Conferences eon seminars protozoa geochronology cyanobacteria The Past the earth Proterozoic geological time blue green bacteria the prokaryotes chronostratigraphic first animal with shell paleoproterozoic mesoproterozoic single celled living thing multicellular living thing neoproterozoic first sponge