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प्रश्न
Assertion (A): The ocean/seawater does not contains calcium in great quantities.
Reason (R): Many of the aquatic animals with shells use the dissolved calcium in the seawater to build their protective shells.
पर्याय
Both A and R are correct and R explains A.
Both A and R are correct but R does not explain A.
A is correct but R is false.
MCQ
उत्तर
Both A and R are correct and R explains A.
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Oceans
या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
