The figure below illustrates how nutrients cycle between organic and inorganic reservoirs. Within each reservoir the nutrient may be available or unavailable for use. 
According to the figure above, what is the inorganic reservoir where phosphorus is unavailable?
Definitions:
Trustworthiness
The ability to be relied on as honest or truthful.
Inoculation Theory
A psychological theory suggesting that exposure to weakened forms of an argument increases later resistance to that argument, similar to how exposure to a virus can create immunity.
Cognitive Dissonance
The psychological discomfort experienced when holding two or more conflicting beliefs, values, or attitudes simultaneously.
Inoculation Theory
A theory suggesting that exposure to a weakened form of an argument strengthens people's ability to refute stronger, future arguments.
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