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.
The definition of cacophony means sounds that are loud, and irritating and out of tune. An example of cacophony is an untalented band warming up before a performance. pl. -Â·nies. harsh, jarring sound; dissonance. Origin of cacophony.