This is a unicellular, (meaning it only has one cell), organism that is different from eukaryotes and bacteria. These organisms are known to live in extreme environments. The rover CURIOSITY that has been recently sent to mars has had programing to investigate weather this type of organisms exists on mars. They are most likely found in temperatures ranging from freezing all the way to boiling hot. They are very useful for research when it comes to developing medicines, due to their easily manipulated cell. They are known to have evolved separately from all other cell life but posses some similar things. Such as genes and cell material and organelles. The picture above is of plant roots, which are known to posses archaebacteria, and help in nitrogen fixation.