Explain the role of heterotrophs in the biological cycle of substances?

Heterotrophs are organisms that use ready-made organic substances for their nutrition. We are among the representatives of heterotrophs, i.e. people, also these organisms include other animals, some plants, most bacteria and fungi.

Heterotrophs maintain an energy balance in nature, regulating the number of plants and other organisms by feeding on them! .. This energy balance is clearly visible in food, if we talk about it in brief, we use plants in our diet, some fox eats a mouse, and a fox, for example, a person eats and each time this ratio is multiplied by 10, i.e. for a mouse to eat, it needs to eat 10 wheat seeds, and a fox needs to catch 10 mice, etc.