Respiration is the physical act of inspiration and exhalation of oxygen. Gas exchange is what happens in the lungs to use the oxygen that is brought in and expel the Carbon Dioxide brought back into the lungs from the cells. Respiration is the physical act of inspiration and exhalation of oxygen.
Definition of polyphony. : a style of musical composition employing two or more simultaneous but relatively independent melodic lines : counterpoint.
In contrast to the independence of the musical lines in non-imitative polyphony, imitative polyphony allows the members of a polyphonic texture to share audible features of the melodic material, as they echo portions of it among the various parts.