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:
IQ Tests
Standardized tests designed to measure human intelligence and cognitive ability.
Monozygotic
Refers to twins that are genetically identical, originating from a single fertilized egg that splits into two.
Dizygotic
Referring to twins that are born from two different eggs fertilized by two different sperm cells, resulting in siblings that are genetically as similar as any other brothers or sisters.
Canalized
A term referring to the limitation of the expression of genetic variability due to genetic or environmental influences, resulting in a trait that is shaped to follow a predictable pattern regardless of variations.
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