Final answer:
The best supported statement by the diagram of the phosphorus cycle is that phosphorus moves through the environment in a continuous cycle with little loss.
Step-by-step explanation:
The best supported statement by the diagram of the phosphorus cycle is b. Phosphorus moves through the environment in a continuous cycle with little loss.
The diagram shows that phosphorus is released into the soil, water, and air through weathering of rocks and volcanic activity. It then becomes available to terrestrial food webs, enters the oceans through various sources, and cycles into marine food webs. Some phosphate from the marine food webs falls to the ocean floor, where it forms sediment. This process demonstrates how phosphorus moves through the environment without significant loss.