Which part of the ear contains the cochlea and hair cells?

Question

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The inner ear contains the cochlea and hair cells, which are responsible for converting sound waves into electrical signals that the brain can interpret as sound. The semicircular canals are also located in the inner ear, but they are responsible for detecting changes in head position and movement, not for hearing. The outer ear consists of the pinna (visible part) and the ear canal, while the middle ear contains the eardrum and the three small bones called ossicles.

Which Part of the Ear Contains the Cochlea and Hair