This Kingdom is also called Eubacteria in some classifications schemes.
Most species are unicellular but colonies can occur.
They are all Prokaryotes . These can be Parasitic, Saprophytic, Chemosynthetic or Photosynthetic . These represent the organisms which first arose on the planet Earth. They are primarily Unicellular but colonies occur. Most species are heterotrophic but some are autotrophs and derive energy from chemicals in the environment or from light via Photosynthesis .