1) The five classes of gram-negative Proteobacteria;
2) the four phyla of gram-negative bacteria(Proteobacteria, Cyanobacteria, Chlorobi, and Chloroflex1);
3) the two phyla of gram-positive bacteria (Firmicutes and Actinobacteria);
4) the remaining bacterial phyla(Planctomycetes,Chlamydiae, Spirochaetes, Bacteroidetes, and Fusobacteria);and
5) The Arcae groups (Thermophiles, Halophiles, Acidophiles,and Methanogens).