Air has only 0.03 % volume of ___________, but it is very important for the world.

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Solution

Air has only 0.03 % volume of, carbon dioxide (CO₂) but it is very important for the world.
As carbon dioxide is required by the plant for the process of photosynthesis which in turn releases oxygen gas into the atmosphere required by us for the process of respiration.
Thus, the air has only 0.03 % volume of carbon dioxide, but it is very important for the world.

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