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• Simply put, it's about the structure of the nasal cavity and the sound resonance created. 
Resonance, as it relates to speech, is the modification of the sound that is generated by the vocal folds as it vibrates (resonates) through the cavities…

  in How do paleontologists know the exact "cry" each type of dinosaur made? Comment by andrew-knight_60bd85b85a711 June 2021