what two important benefits do heterotrophs derive from photosynthesis?
 The important benefits are photosynthesis consumes carbon dioxide and produces oxygen. Heterotrophs therefore depend on photosynthesis as a source of oxygen. In addition, photosynthesis sustains the organisms that heterotrophs consume in order to stay alive. Even if a heterotroph is strictly carnivorous and does not eat plants, it must eat animals that eat plants to survive. 