To find out what substances are food for yeast, you can put down experiments with different media: sugar, starch, gelatin, vegetable oil, flower fertilizers. We put a yeast culture in each nutrient medium, put it in a warm place and after a few days we will see the results – foaming will be a sign of the yeast’s vital activity (nutrition). For persuasiveness, you can take a drop of liquid on a glass slide and examine it under a microscope and see the yeast colonies. Only in an environment where there is sweetness – sugar, will yeast multiply, because eat carbohydrates – sugars.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.