Q:

Which structures are partially composed of cells of endodermal origin:

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Which structures are partially composed of cells of endodermal origin:


  1. tympanic membrane
  2. pharyngeal-tympanic (eustachian) tube
  3. membranous labyrinth of semicircular canals
  4. both A and B
  5. all of the above (A-C)

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D

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