Contrast the electrons transport chain in photosynthesis with cellular respiration by identifying the source of the high energy electron

Photosynthesis and cellular respiration are in their most obvious ways mirrors of each other. When the Earth had a lot less oxygen in the air, photosynthetic organisms used Carbon Dioxide and produced oxygen as a byproduct. Today, plants, algae, and cyanobacteria utilize this similar process of photosynthesis. All other organisms, including animals, have evolved to utilize some form of cellular respiration. Both processes make extensive use of electron flow.