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Milder methods of killing or preventing the growth of mainly pathogenic micro-organisms include the following except use of ____________________________
________________ pathogenic micro-organisms and their spores are killed by 20 minutes using an autoclave which sterilizes with saturated steam
_________________ are chemicals produced by micro-organisms like bacteria and fungi and are not harmful to humans.
Aedes mosquito breeds in stagnant water and spread ________________________
Vaccination, a disease-prevention measure, is ensured by injecting the body with of any of the following except _______________________________