I know a few useful Micro- Organisms:Yeast and some bacteria's are useful
They can make you sick, some can kill you and can give you infections.
Friendly MicroorganismsMicroorganisms are used for various purposes. They are used in the preparation of curd, bread and cake. They have been used for the production of alcohol since ages.They are...
helpful microorganisms help our bodies proceed health
Essential for life, which most people consider pretty useful