Why Is Net Primary Production (NPP)a More Useful Measurement to an Ecosystem

Multiple Choice

Why is net primary production (NPP) a more useful measurement to an ecosystem ecologist than gross primary production (GPP) ?

A) NPP can be expressed in energy per unit of area per unit of time [J/(m².yr].
B) NPP is expressed in terms of carbon fixed by photosynthesis for an ecosystem.
C) NPP represents the stored energy available to consumers in an ecosystem.
D) NPP is the same as the total biomass of the photosynthetic autotrophs present.
E) NPP shows the rate at which the total biomass is utilized by primary consumers.