Answer:
Oxygen is a byproduct of photosynthesis.
Explaination:
As oxygen is reactant in the process of cellular respiration ,the foremost product of photosynthesis is glucose, which is the molecule that provides energy to run the processes of the cell. Oxygen is mainly a byproduct of the process of photosynthesis . Because it is excreted out from the plants during photosynthesis and all oxidation reactions take place in the presence of glucose and other carbohydrates
