Chemical or organic substances required by an organism, for its survival is called nutrients. Each organism needs food as a source of energy, for its survival. Nutrients help the producers to produce the food.
Moreover, the producers obtain their energy form the physical environment and its raw materials like water, minerals, air, etc. Consumers obtain a part of nutrients from the producers and the rest from the environment.
In addition, nutrients play a very important role in growth and development of new tissues and repairs the worn out tissues of the organism. All such processes help to sustain the life.
Thus, the circulation of various nutrients occurs between the organism and its environment by biogeochemical cycle.