The author implies that which of the following is the primary reason that degradation is as important as synthesis to the smooth operation of the carbon cycle? A. Most of the polymers and organic compounds found in the plant kingdom are chemically unstable. B. The synthesis of some organic material deprives life processes of an energy source. C. Decomposition permits the recycling of carbon that would otherwise be fixed in certain substances. D. Many organisms cannot use plants as a source of food, but can feed on bacteria and fungi. E. Bacteria and fungi could not survive if some carbon compounds were not degraded.