Which of the following structures helps in excretion and respiration in molluscs?

  • A
    Nephridia
  • B
    Feather-like gills
  • C
    Flame cells
  • D
    Tentacles

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$A$ shell of calcium carbonate,a mantle,and a radula are characteristic features of which of the following?

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$A$ : Radula is a rasping organ found in all molluscs.
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