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according to me,CO2 is not a waste substance because plants need it for photosynthesis.

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This where we have to define 'waste'. I suggest it's a substance that is formed in a process and not required further. So, I think CO2 IS a waste product in the case of animals, also in the case of many plants (because their respiration produces it), although I agree that green plants do use it in photosynthesis.

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14y ago

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