Balance of oxygen and carbon dioxide in atmosphere is maintained by :
A
plants
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B
animals
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C
humans
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D
all of the above
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Solution
The correct option is D all of the above
The balance of oxygen and carbon dioxide is maintained by plants, animals and humans. Green plants use up carbon dioxide during photosynthesis and release oxygen as a product. Whereas, animals and humans use up oxygen during respiration and release carbon dioxide as a by-product. This maintains the overall balance of oxygen and carbon dioxide.