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A domain in the 3 domain system which includes the Eubacteria groups of organisms. A key that is used to examine characteristics of organisms to help classify them by process of elimination. All multicellular, heterotrophic organism which have no cell wall, only a cell membrane and sexually reproduce. All multicellular, autotrophic organisms which have a cell wall compose of cellulose and sexually and asexually reproduce. Mostly unicellular with a few multicellular organisms and is often called the catch all kingdom because it takes all things not in the other kingdoms. Bacteria which have peptidoglycan in their cell wall composition and many are the disease causing bacteria within groups of organisms. This group is mostly multicellular with a few unicellular, heterotrophic organisms with chitin for a cell wall. Bacteria which live in very harsh, extreme environmental conditions and lack peptidoglycan in their cell wall.