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.
Polyphonic is when there are two or more independent lines, as opposed to music with only one voice dominant voice accompanied by instruments. An example of this is two different people singing on top of one another, however neither of these singers predominate the other with instruments behind them.