Which statement is true for $Spongilla$,$Leech$,$Dolphin$,and $Penguin$?

  • A
    All possess bilateral symmetry.
  • B
    $Penguin$ is homeothermic while the others are poikilothermic.
  • C
    $Leech$ is a freshwater annelid,while all others are marine.
  • D
    $Spongilla$ has special collar cells called $Choanocytes$,which are not found in the others.

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