Which choice best describes the phosphorus cycle?

The phosphorus cycle is the bio-geochemical cycle that describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere. The atmosphere does not play a significant role in the movements of phosphorus, because phosphorus and phosphorus-based compounds are usually solids at the typical ranges of temperature and pressure found on Earth.

1. protection 2. homeostasis 3. storage4.blood formation5.bone marrow 6.movement