Fill in the blanks :
(1) Except for the …………….., none of the bones of the skull can move.
(2) The spinal cord originates from the …………… .
(3) The longest and the strongest bone in the human body is …………… .
(4) …………….. is the smallest bone in our body.
(5) The vertical, flat bone in the chest is called the ……………… .
(6) The …………… joint moves in a 180° angle.