Many marine animals use carbonates dissolved in sea water to make their shells. Which of the following components is reduced in our atmosphere by this biological phenomenon?

Oxygen

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Calcium carbonate

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Carbon dioxide

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Nitrogen

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Solution

The correct option is B Carbon dioxide
Carbonates in sea/ocean are formed when the atmospheric carbon dioxide gets dissolved with the water in sea/ocean. This carbonate is used by several marine organisms to build their calcareous shells. The major component of these calcareous shells is usually calcium carbonate. Thus, in the process of formation of calcareous shells by marine organisms, carbon dioxide (CO $_{2}$ ) is reduced.
So, the correct answer is option C.

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