Combustion consumes oxygen. Fire is a combustion reaction, consumes oxygen and produces carbon dioxide.
Respiration in animals: that's us, when we breathe, we respire. We breathe in O2 and breathe out (produce) CO2
Photosynthesis does the opposite of what we do. This occurs in plants. They take in CO2 and produce O2 for us to breathe. It would be this answer