The best definition for biogeochemical cycles is the pathway by which mattress transferred between organism and their environment.
Therefore, the correct answer to the question is option b.
Explanation:
Biogeochemical cycles are the continuous cycle which occur between environment and organisms. In this cycle both the environment and the organism are benefited. The matter which is essential for the organism is taken by them to live their life. And in return they release the materials back into the environment.
The release material is consumed by the the plants, trees, Earth and converted back into the material which is important for the organisms. While converting back the environment is benefited in its various ways.
A biogeochemical cycle corresponds to an exchange of different elements such as carbon, nitrogen, water, phosphorus, nitrogen, carbon and other elements, between living beings and the environment (either decomposition or production processes).
