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microbiology chapter 1: an invisible world Questions and answers 2025 which of the following is true of the microbial world? a. all microbes are harmful. b. humans could survive without microbes. c. many microbes are helpful. d. most microbes are pathogenic. - c. many microbes are helpful. when did humans first suspect the existence of microbes? - in prehistoric times which indiv. first observed unicellular organisms, which he called 'animalcules' using a microscope he developed? - antonie van leewenhoek to reduce risk of open flame from Bunsen burners, microbiologists are increasingly using which of the following devices for easy, rapid bench top sterilization of small pieces of equipment? a. autoclaves b. ethylene oxide c. incubators d. micro-incinerators - d. micro-incinerators the swedish botanist known for having developed an important biological classification system is which of the following people?
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