Role of microorganisms in food production

i want that what is the role of micro-organisms in food production plzzzzzzz tomorrow is my assigment

although many microorganisms are pathogen (cause diseases); other microorganisms are useful for humankind; like:
- Lactobacillus and Lactoccus: some of them live in the gut flora, and transform lactose and other sugars into lactic acid. It is also used by industries to make fermented food(cheeses, wines, yoghurt, sauerkraut...)
- Clostridium butyclicum s used for commercial preparation of riboflavin, and vitamin B
- Baker's yeast or Saccharomyces cerevisiae, a single-celled fungus, is used to make bread and other wheat-based products, such as pizza dough and dumplings.
-Yeast species of the genus Saccharomyces are also used to produce alcoholic beverages through fermentation.
- Shoyu koji mold (Aspergillus oryzae) is an essential ingredient in brewing Shoyu (soy sauce) and sake, and the preparation of miso, while Rhizopus species are used for making tempeh.
- Some types of cheeses require inoculation of milk curds with fungal species that impart a unique flavor and texture to the cheese, like Roquefort, Stilton...
-Agar, a gelatinous substance derived from red algae, has a number of commercial uses.