Question: "Much of the carbon dioxide produced by green plants is not excreted as a metabolic waste because it___."
Answer: "At the majority, carbon dioxide produced by green plants isn't excreted as a metabolic waste because it is used for the process of 'photosynthesis.' Photosynthesis is a process in which takes place only in plants and is a cycle of transferring light energy into chemical energy. Hence, photosynthesis would be my best guess for the best choice, that is without any options."