Question

The shell of Nautilus is composed in sea when there is higher concentration of

a.

carbonate (CO₃⁻²) ion

b.

calcium (Ca⁺²) ion

c.

oxide (O⁻²) ion

d.

hydrogen (H⁺) ion

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Answer: (c).oxide (O⁻²) ion

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Q. The shell of Nautilus is composed in sea when there is higher concentration of

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