Final answer:
Photosynthesis and cellular respiration are opposite processes that involve the conversion of energy. They have opposite reactants and products, and also play a crucial role in recycling oxygen and carbon dioxide in Earth's atmosphere.
Step-by-step explanation:
Photosynthesis and cellular respiration are almost opposite processes. During photosynthesis, energy from the sun is converted into glucose, while during cellular respiration, glucose is broken down to produce energy in the form of ATP. The reactants of one process are the products of the other, creating a cycle that helps to store and release energy in living organisms. Additionally, photosynthesis releases oxygen and consumes carbon dioxide, while cellular respiration consumes oxygen and releases carbon dioxide.