What is the purpose of the biogeochemical cycles?
-to cycle energy through a food chain
-to recycle matter through the biosphere
-to recycle rocks through the layers of earth
-to cycle nutrients through the human body

-to recycle matter through the biosphere

The biogeochemical cycles move through mainly the biotic and abiotic components of the earth, more elaborately the spheres -biospheres, lithosphere, hydrosphere and atmosphere regions of the ecosystem. These biogeochemical cycles, from its terminology and discernable word morphology- involves the biological, geological and chemical components that make out to complete an exact and purposed cycle. The purpose in these cycles are to maintain balance and to ensure the ongoing process of the living and non-living organisms in the environment. These cycles’ help to living organisms survive and thrive. One popular example is the water cycle. 

The diaphragm is what i think ur talking about