The Eubacteria are one of the three domains of life, along with Archaea and Eukarya. Eubacteria are prokaryotic, meaning their cells do not have defined, membrane-limited nuclei. Eubacteria are among the most common, yet diverse classification of life. Many are harmful to human life, yet equally many are crucial to the success of Earth's many ecosystems.
Cyanobacteria (Phylum Cyanonta)
Cyanobacteria can be found in most aquatic and terrestrial habitats. They are responsible for toxic algal blooms, where population grows immensely in a nutrient rich habitat. Cyanobacteria also play a very important role in the environment by performing a processes called nitrogen fixing. Cyanobacteria take atmospheric nitrogen (N2) and fix it for plants to turn it into proteins and amino acids by turning it into nitrites, nitrates, and ammonia. Cyanobacteria also form structures called stromatolites, which are rounded masses of dead cyanobacteria that have been cemented together over thousands of years.
Phylum Schizonta
Made of heterotrophic, nitrogen-fixing bacteria. These organisms absorb atmospheric nitrogen and release solid nitrogenous compounds which others organisms such as plants in turn take in. Rather than produce their own energy, members of this phylum are heterotrophic.