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unicellular, multicellular, two subkingdoms, circular DNA w/o protein
extreme bacteria, methanogens, halophiles, thermoacidophiles
extreme areas (bogs), use methane/gives off methane
live in extremely salty areas
live in heat/acidic environments, hot bogs
3 shapes: coccus (round), bacillus (rod), spiral (spirilla)
rod shapped, ecoli, gives off vitamin K
round, strep-throat, vaginal yeast infection
prokaryotes, lack nuclei and other membrane-enclosed organelles, reproduce by binary fission