Place theory, frequency theory, duplicity theory, and volley theory, have all been provided as explanations for perception.

Place theory, frequency theory, duplicity theory, and volley theory, have all been provided as explanations for "pitch" perception.

Pitch is the perceptual trait of a sound that relates to its recurrence. Pitch is identified with tone recurrence in unadulterated tones and to the basic in complex tones. Pitch perception enables us to arrange sounds on a melodic scale.There is fractional help for every one of Place theory, frequency theory, duplicity theory, and volley theory, showing that each of the three components assume a job in pitch observation.  

uhh idk for sure but i think it makes it difficult to pump the oil through the oil rigs

the answer is       political office  

hope this .