Which cycle is most responsible for linking the other biogeochemical cycles? 

A)  phosphorus cycle 
B)  hydrologic cycle 
C)  carbon cycle 
D)  nitrogen cycle

The hydrologic cycle is responsible for linking the other biogeochemical cycles by transferring water and nutrients among them. For example, the water cycle is critical to the carbon cycle because it affects the availability and distribution of water necessary for plant growth and photosynthesis. Similarly, the nitrogen and phosphorus cycles also rely on the hydrologic cycle to transport nutrients through the environment.