text: what is archaea-and eukarya- they are biology words i need to know what they both mean? also bacilli and cocci. these are vocab words that i can't find the meaning to. hope some one knows what these four mean archea- the domain of bacteria like organisms that live in extreme environments eukarya- the domain of organisms that have eukayotic cells includes kingdom protistia, fungi, plantae,animalia bacilli- a rod shaped bacterium( e.coil is shaped this way) cocci- spherical bacterial cell