Kingdom Archaea
In the Archaea kingdom, organisms are Prokaryotic, unicellular, and have a cell wall. The organisms can be both Autotrophic or Heterotrophic, this means some species are able to make their food while some have to get food. Archaea are found in extreme environments.
Examples
Candidatus Korarchaeum cryptofilum, Nanoarchaeum equitans, and Nitrosopumilus maritimus.
Interesting Facts
1) They're more ancient than eubacteria
2) They can Live in toxic climates
2) They can Live in toxic climates