century was able to examine and write oral bacteria for the first time in 1828 the scientist christian ehrenberg introduces the term bacterium itself, when he studied e. coli bit bacteria without spores in the 19th century, it became clear to researchers that bacteria play an important role in health and the human condition, but it became possible to fully study the microbiota only after the discovery of gene sequencing technology by frederick, senker, a microbiologist. carl huese, divided seven microorganisms into archaic bacteria and eukaryotes of this classifications are used and now eukaryotes have a nucleus in bacteria. no archaea. these are simple single-celled microorganisms that live in extreme conditions in geysers at the bottom of the seas and oceans. bacteria live in a variety of environments that we contact. we are with them much more often than serhias, because they differ from each other next to the function, for example, bacteria can break molecules, carbohydrates and produce fatty acids, while archaea do not. at the end of 2021, belarusian geneticists announced the creation of a