Detritivore fungi
Microorganisms are used to ferment grain for beer and grape juice for wine. They are also used to make milk into cheese and yogurt.
Like all living things, nutrients are required for survival. (Survival is the prime directive, and after that reproduction is next on the "to do" list, for all living things.)
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Any food made of self raising flour contains Yeast which is a micro organism.Also yogurts contain a type of bacteria which is also a micro organism.