Students are presented with two different diagrams showing the use of gases in cellular respiration and photosynthesis and asked to explain which is correct.
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• Student A says model A is correct because oxygen is a product of
photosynthesis and a reactant for cellular respiration
Student B says model B is correct because carbon dioxide is a product of
photosynthesis and a reactant for cellular respiration
Which student is correct and how could the model be improved?