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.
Actually, most music contains some sort of polyphony. A piece of music is not necessarily either monophonic, homophonic or polyphonic, it may switch back and forth as the music progresses. Which means that some passages in the Peer Gynt suite can be monophonic, while some other are polyphonic, etc.