Net Primary Productivity Is the

Net primary productivity is the

A) total amount of energy fixed for photosynthesis in an area,minus the energy wasted or used.
B) for plant respiration and maintaining existing tissue.
C) total amount of energy fixed for photosynthesis in an area.
D) percentage of the total vegetation surface that is a healthy green color.
E) ratio of the population of autotrophs to the population of heterotrophs in an ecosystem.