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Micro = very  small biology = the study of living organism microbiology: the study of very small living organisms (microorganisms or microbes) Microorganisms (M.O) are ubiquitous (found everywhere) pathogens: the microorganisms that causes disease (Germs) Biotechnology: use of M.O. in industry (food or chemical industries, antibodies production) indigenous microflora: M.O that live on and in our bodies antibiotics: substance produced by M.O. that is effective in killing or inhibiting the growth of other  M.O. Bioremediation: using genetically engineered M.O. that is effective in killing or inhibiting the growth of other M.O.