Answer:
neither photosynthesis nor respiration.
Explanation:
Photosynthesis is the process by which the green plants, in the presence of sunlight makes their own food. In the process carbon dioxide is absorbed and oxygen is released.
[tex]6CO_2 + 6H_2O\ (sunlight)\ \rightarrow C_6H_{12}O_6 + 6O_2[/tex]
Respiration is the intake of oxygen and the metabolism of the glucose in which it is breakdown and releases carbon dioxide.
[tex]C_6 H_{12}O_6 + 6O_2\rightarrow 6CO_2 + 6H_2O + ATP[/tex]
In neither of the two processes, carbon dioxide is splitted.