A. Human teeth [ not useful for ripping or tearing food but suitable for grinding and chewing. Also they are better for making sounds like f & v ]
B. Human lips [ they help in making sounds like p & b because they are flexible ]
C. Human mouth [It is relatively small and can be opened and closed rapidly]
D. Human tongue [ It is small, thicker and can be used to shape a wide variety of sound inside the cavity ]
E. Human larynx or voice box [ It contains the vocal cords or vocal folds . It differs in position from primates such as monkeys ]
F. Human Pharynx [ it is above the vocal cords . It acts as a resonator for increased range and clarity of the sounds produced]