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a. Set up G has only one plant but two heterotrophs. Plants inhale carbon dioxide and heterotrophs exhale carbon dioxide. Therefore, in this set carbon dioxide is more than oxygen
b. Set E has more oxygen because there is a plant in this set which inhale carbon dioxide but have not use oxygen.
These answers are true if the plants do photosynthesis and if they do respiration then the answer is
a. Set up E because plant use oxygen during respiration.
b. Set up E
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