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B
Unio
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C
Teredo
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D
Nautilus
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Solution
The correct option is BChiton Chitonaregroup of marine molluscs. They belong to the classPolyplacophora. They are known as sea cradles. They have a dorsal shell. The shell is composed of many shell plates. They are found in different parts of the world. They can be found in the warm as well as cold water.