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Content: Archea in turn are very remote and many of their species live in some of the harshest places on the planet. These include extreme acidic, saline (extreme halophiles), radioactive, hot (extreme thermophiles), and cold environments, many of which are tremendously toxic or precarious to humans. Although PCR is giving biologists a better opportunity to further study these curious micro-organisms without culturing them in a lab it is still a much more drawn out process than obtaining live samples. For now, the Domain Biology has a significant advantage in its study than Archaea. also it is important to take into account that human diseases are not caused by arcgaeal organismss
113) What are the five focal groups (for us) within the bacterial domain, and what are representative species from each of the groups? Is this presentation of five bacterial groups intended as a comprehensive survey of bacteria? The five focal groups we are studying within the bacterial domain are Spirochetes, Chlamydia, Cyanobacteria, Firmicutes and Proteobacteria. Spirochetes 
-Borrelia Burgdorferi (Lyme disease)
-Treponema Pallidum (Syphilis disease). Chlamydia
-Chlamydia Psittaci (Bird handlers disease). Cyanobacteria 
-Spirulina
-Rivularia
Firmicutes (gram positive)
-Staphylococcus
-Streptococcus
-Bacillus.