Answer :
Because, all these cycles include living organisms, the biosphere and the chemical factors in them
Answer: The correct answer is- Because all cycles of these elements include living organisms, the biosphere, and the chemical factors that are present them.
A biogeochemical cycle can be described as the cycling of chemical substances through the biotic ( that includes the living forms, which is present in the biosphere) and abiotic ( that includes the non living parts, which lie in the lithosphere, atmosphere, and hydrosphere compartments of Earth) component.
The cycling of phosphorous, water, nitrogen, and carbon occurs through living and non living compartments of earth.
Thus, they are considered as biogeochemical cycle.