A) Someday all the \[{{O}_{2}}\] will be used up by animals.
B) Someday all the \[C{{O}_{2}}\] will be used up by plants
C) The amount of \[{{O}_{2}}\] is increasing and that of \[C{{O}_{2}}\]is decreasing in our atmosphere.
D) The level of \[{{O}_{2}}\] and \[C{{O}_{2}}\] in the atmosphere is kept constant.
Correct Answer: D
Solution :
The level of \[{{O}_{2}}\] and \[C{{O}_{2}}\] in the atmosphere is kept constant.
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