Yeast is a unicellular fungus. They live on the surface of leaves and fruits, in wound sap of plants, dead phytomass, and soil. Some types of yeast live in the intestines of herbivorous insects, helping them to digest food, others cause diseases (mycoses) in plants, animals and humans.
People have long been using yeast in baking, kvass and brewing, and winemaking. Now they are also used in industry for the production of alcohols, sugar substitutes (xylitol) and other food additives, vitamins, and enzymes.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.