The voice pitch is a trait that has evolved through sexual selection of humans and has become sexually dimorphic. This trait is sexually dimorphic because for males the voice pitch has the tendency to be lower and this because the ‘adam’s apple’ is a thicker layer of cartilage that influence the vocal cords in males along with higher testosterone levels predict low voice men.. For females, the voice pitch tends to be lower because without this extra layers of cartilage makes the vocal cords have a higher pitch and also with higher estrogen levels enables a higher pitch voice. Sexual selection is the dominant evolutionary cause for the sexual difference in voice pitch, evidence suggests that the sexual difference in the human voice evolved
