A) Some day all the oxygen will be used up by the animals.
B) Some day all the carbon dioxide will be used up by the plants.
C) The amount of oxygen is increasing and that of carbon dioxide is decreasing in our atmosphere.
D) The level of oxygen and carbon dioxide in the atmosphere is kept constant.
Correct Answer: D
Solution :
The level of oxygen and carbon dioxide is kept constant due to the maintenance of balance between animals and plants.
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