<prompt> The pharyngeal structure established in early age and remain constant throughout life is?Depth of oropharynxDepth of nasopharynxWidth of nasopharynxWidth of oropharynx  <response>: Multiple recent researches have concluded that the depth of nasopharynx is established during the first 2 years of life and these dimensions remains constant thereafter.Ref: Graber LW, Vanarsdall RL, Vig KW, Huang GJ. Orthodontics: current principles and techniques. 