Review
Copyright ©2010 Baishideng Publishing Group Co.
World J Biol Chem. May 28, 2010; 1(5): 160-180
Published online May 28, 2010. doi: 10.4331/wjbc.v1.i5.160
Table 1 Evolutionary chronology of the 5 organismic kingdoms
Million of years ago
4200Ribozymatic pre-cellular agents
3800Prokaryotic microfossils (bacteria, archaea)
1200Protoctist fossils (unicellular eukaryotes)
750Animal fossils
450Fungus fossils
350Plant fossils