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Q.

What are sea shells made up of? 

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a

Sodium sulfate

b

Calcium carbonate

c

Nitric acid

d

Zinc sulfate

answer is D.

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Detailed Solution

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  • Atmospheric carbon dioxide dissolves in seawater and is converted to carbonate.
  • Marine organisms use this carbonate to form their shells. 
  • So sea shells are made up of calcium carbonate.
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