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.
This type of interaction is known as codominance because both traits are visible
