The diagram illustrates how energy moves through an ecosystem. Gross productivity is shown by photosynthesis. Producers use some energy in respiration, and the energy remaining is the net productivity. This may also be written as the equation: net productivity = gross productivity - respiration. A fraction of the net productivity is transferred to herbivores. Which calculation shows the fraction of net productivity transferred to herbivores?
- A$\frac{0.075}{1.8}$
- B$\frac{0.75}{1.8}$
- C$\frac{0.75}{4.0}$
- D$\frac{0.75 + 0.075}{1.8}$