Question: The major functions of the middle ear are to i. regulate the air pressure relative to the outer ear ii. transfer the vibrations to the inner ear question iii. separate the outer ear vibrations from the inner ear iv. amplify sound vibrations Oa. i, ii and iii Ob. i, ii, and iv Oc. ii, iii, and iv O d. i, ii, iii, and iv. Need Assignment Help?