A structure peculiar to Nautilus is

Siphuncle/living tube

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External shell

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Spirally coiled shell

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Nocturnal nature

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Solution

The correct option is A Siphuncle/living tube
A structure peculiar to Nautilus is siphuncle. It is a living tube that runs through the spiraled shell of Nautilus. It is used for throwing out water and gases as the shell grows throughout the life. It also helps Nautilus to move upward by decreasing the density of interior.
Thus, the correct answer is option A.

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