No exact answer is possible. Certainly many thousands
Virus is most harmful
poison
There are many products of an organism that destroys or weakens harmful microorganisms. This could be an enzyme for example.
Type your answer here... What is useful of a microorganism
One harmful effect is dying or diesease
Tonsils
tintre
An example of a microorganism acting in a harmful way is the bacterium Streptococcus pneumoniae, which can cause pneumonia, meningitis, and other serious infections in humans.
Protists - a mixed group of single and many celled organisims of all types.
no, atoms aren't alive. A microorganism has to be at least a bacterium, which are composed of many atoms.
No, there are many very different types of microorganisms. The name "microorganism" just means "organism too small to see without magnification". This category of organisms includes bacteria, algae, protozoa and zooplankton, to give some examples.
Mould eats potentially harmful microorganism, though, as it is itself harmful, eating it isn't recommended. FYI- Penicillin is a form of bread mold.