A) Nautilus
B) Echinus
C) Limulus
D) Euplectella
Correct Answer: A
Solution :
Mantle, foot and shell are characteristics of a mollusc. Out of the given options Nautilus is a mollusc, it is a tetrabranch cephalopod. The shell is external and coiled over the head. Nauctilus is always active at night and rests on bottom during day.
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