Your unknown bacteria maybe one of the following 13 bacteria: Proteus vulgaris, Edwardsiella tarda, Enterococcus faecalis, Escherichia coli, Bacillus sphaericus, Pseudomonas aeruginosa, Morganella morganii, Bacillus cereus, Staphylococcus aureus, Enterobacter aerogenes, Bacillus megaterium, Klebsiella pneumoniae, or Shigella flexneri. please make a dichotomous key of these bacteria .