Single circulation,i.e.,blood flows through the heart only once during one cycle of passage through the body,is exhibited by:

  • A
    Labeo,Chameleon,Salamander
  • B
    Whale,Dolphin,Turtle
  • C
    Hyla,Rana,Draco
  • D
    Hippocampus,Exocoetus,Anabas

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