Kingdom Monera includes prokaryotic organisms that are either autotrophic or heterotrophic, according to Ohio University. However, as the University of New Mexico states, the term "Kingdom Monera" is outdated and prokaryots are now classified as either Eubacteria or Archaebacteria.
Heterotrophic representatives of Eubacteria absorb the nutrients from the environment while autotrophs, such as Cyanobacteria, obtain energy for life processes through photosynthesis. Autotrophic organisms classified as Archaebacteria are found in extreme environments, such as volcanos, hot springs or deep oceans, where they can’t use energy from the sun to produce food. Instead, they use energy from chemical reactions, according to National Geographic.