Question

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

Answer

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