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Virus is most harmful
poison
One harmful effect is dying or diesease
Tonsils
tintre
Bacteria infecting a cut.
No exact answer is possible. Certainly many thousands
Sterilization of utensils and surfaces is important in dentistry so as to promote patient care. Harmful bacteria can spread to humans through the use of unsterilized equipment.
There are many products of an organism that destroys or weakens harmful microorganisms. This could be an enzyme for example.
Microorganism are sometimes only harmful in certain environment. Some organisms that may be harmful to some people or animals may not be harmful to others.
Windex is best used on glass. It can be harmful to other surfaces over time.
microorganisms can be harmful and useful! Yeast is a microorganism and is used in bread. but some bacteria (microorganism) can be harmful, they can make you ill or kill you. but in our imune system there are antibacteria fighting off disease and protecting us. So microorganisms can be harmful and beneficial