Which of the following statements is true for all four: $Spongilla$,$Leech$,$Dolphin$,and $Penguin$?

  • A
    $Penguin$ is homeothermic,while the other three are poikilothermic.
  • B
    $Leech$ is freshwater,while all others are marine.
  • C
    $Spongilla$ has specialized collar cells.
  • D
    All possess bilateral symmetry.

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