Flame cells and nephridia are found in $ \text{Platyhelminthes} $ and $ \text{Annelida} $ respectively.

  • A
    Platyhelminthes and Annelida
  • B
    Annelida and Nematoda
  • C
    Cnidaria and Mollusca
  • D
    Mollusca and Echinodermata

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