4. Depending on whether or not organisms use O as an oxidant, they are classified as aerobic or 2 anaerobic. In addition, organisms are classified based on their sources of carbon and their sources of energy. 4-1. What are the general carbon sources? 4-2. What are the general energy sources? 4-3. What are the four general types of organisms based on their specific sources of carbon and energy? Give one specific example of each of these four..