Some microorganisms are part of the body's natural processes. For instance, the bacteria of your digestive tract help you to digest food. Other microorganisms can cause disease. Some otherwise beneficial bacteria can be harmful if they become too abundant.
One harmful effect is dying or diesease
tintre
Type your answer here... What is useful of a microorganism
they harm the plants
it is harmful at one side and useful at the other side.
cause sleeping sickness
Virus is most harmful
Not all but some of the micro organisms are responsible for the disease and infection causing. Spoil the food materials.
poison
Viruses and some bacteria aren't useful.
pathogen
it is useful because it can aware all the peoples to now about it and also to protect or environment to such harmful effects