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B
Chiton
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C
Unio
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D
Nautilus
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Solution
The correct option is C Nautilus The Nautilus is a pelagic marine mollusc. They belongs to the cephalopod family. They possess an external skeleton. This skeleton supports and protects its body. The body of this organisms are characterized by involute or convolute shells. These are generally smooth. The shells maybe with compressed whorl sections, straight sutures, and a tubular siphuncle.