sunlight and air are inexhaustible natural resources comment

this is because they dont get over or exhausted and are presesnt in unlimited quantities.
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sunlight and air are in unlimited quantity or they can not be exhuasted
​therefor  sunlight and air are kept under in-exhuastable natural reasorce
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they are in unlimited quantity therefore 
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They are inexhaustible because they are unlimited in nature.
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