Net Primary Productivity (NPP) Is the Rate at Which Producers

Multiple Choice

Net primary productivity (NPP) is the rate at which producers use photosynthesis to produce and store chemical energy minus ____.

A) the rate at which they use some of this stored chemical energy through aerobic respiration
B) the amount of chemical energy they already have stored
C) the rate at which the producers are consumed
D) the average rate of photosynthesis in cloudy conditions
E) the average rate of photosynthesis among similar organisms