How microorganisms are our friends?

Write 10 lines on the usefulness of microorganisms in our lives.

How do microorganisms spoil food?

How does microorganisms enter into our body?

What are Brewer's yeast? Which microorganisms are used in the production of beer and wine and how?

Microorganisms play an important role in our lives. Various microorganism are used in preparing food and beverages for both domestic and industrial use. They can also prove harmful to us as they cause a number of diseases in human, plants and animals. Microorganisms also spoil clothing and leather products. Identify the multicellular filamentous algae.