At which point in a biogeochemical pathway are elements unavailable to plants?

A) when the element is located in a reservoir
B) when the element is located in the exchange pool
C) when the element is dissolved in water
D) when the element is located in the soil
E) when the element is located in the atmosphere

Biogeochemical Pathway

Cycles that involve the movement and chemical transformation of substances through biological, geological, and chemical processes on Earth.

Elements

Substances that cannot be broken down into substances with different properties; composed of only one type of atom.

Reservoir

Location in a biogeochemical cycle where a chemical or resource is stored for long periods of time and is typically unavailable to living organisms.