A dichotomous key of the following in a diagram or flow chart form. 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).