In frogs,the $Fenestra$ $ovalis$ is:

  • A
    An opening in the auditory capsule that separates the middle ear from the inner ear.
  • B
    An air-filled cavity of the middle ear.
  • C
    $A$ connection between the pharynx and the tympanic cavity.
  • D
    An external opening of the tympanic cavity,covered by the tympanic membrane.

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