What is the importance of bacteria in nature?

Bacteria are incredibly widespread in nature, and their main importance is the constant circulation of nature. The bacteria live in the soil, making it fertile. Without them, the production of sour cream, yoghurt and cottage cheese would have been impossible. They are responsible for the decomposition of dead animals and plants, turning them into chemical elements that are returned to the biological cycle. There are beneficial bacteria, without which our normal digestion is impossible. And there are harmful ones that cause a variety of diseases in humans and animals. The role of bacteria is so great that it is believed that without them modern life would be impossible.