Plants absorb inorganic or chemical elements through their roots. And converts it into biological elements.
These biological elements are transferred to different organisms through the food chain.
With the death of these organisms, the biological element is again converted into inorganic or chemical elements.
The process of change in the biological state of inorganic elements or chemical elements as well as their return to this biological form is called biogeochemical cycle.
The water cycle, carbon cycle, oxygen cycle, nitrogen cycle, phosphorus cycle, rock cycle, etc. are studied in biogeochemical cycles.
Here we will study the nitrogen cycle, the oxygen cycle, and the carbon cycle.