Time of useful consciousness
Classified in Geology
Written at on 
English with a size of 1.73 KB.
3.5 billion years old
embedded in rocks in western Australia: stromatolites(fosilized bacteria)
Prokaryotes dominated from 3.5 to 2 billion years ago.
During this time, the first divergence occurred:Bacteria and archeae
5. First photosynthetic organisms around 3.5 billion years but Oxygen began accumulating in the atmosphere about 2.7 billion years ago. Cyanobacteria are photosynthetic prokaryotes that are still present today → produced oxygen. Sequestered carbon dioxide in organic molecules.
These bacteria changed the Earths atmosphere.
6. The oldest eukaryotic fossils are ~2 billion years old.
Symbiotic community of prokaryotes living within larger prokaryotes.
The first eukaryotic cells-theory of endosymbiotic
8. The oldest fossils of multicellular organisms are ~1.2 billion years old.
The c elegans and volvox colonial algae
10. The oldest animal fossils are ~700 million years old
Mamals 50-60 million years ago.
.