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Answers:    External auditory cAnal
It conducts sound-waves to the tympanic membrane allowing the tympanic membrane to be relatively safe from trauma it would be exposed to if it be on the outside of the body .
It conducts the waves concentrated by the pinna or outer ear structure that act like a satellite reciever dish .
Also it have small glands in its bin liner that secrete viscid substance that catch particles protecting them from man accumulated on the tympanic membrane or eardrum .

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