Carbon dioxide fixation can be enhanced by enhancing the efficiency of:

Explanation

Carbon dioxide fixation, particularly in the context of photosynthesis, can be enhanced by enhancing the efficiency of the enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO). RuBisCO is a key enzyme involved in the first step of the Calvin Cycle, where carbon dioxide is fixed into organic molecules.