"Within ecosystems, phosphorus moves from the soil or water to plants, then to the animals that consume them, and then to the Earth as those animals die. Additionally, the weathering of rocks causes phosphates to run off into water or soils, where it is eventually stored in underground or underwater reservoirs. This best describes a(n) _____.
A. biogeochemical cycle
B. energy pyramid
C. biomass cycle
D. ecosystem
E. biome"