Which one of the following is the correct description of a certain part of a normal human skeleton?

• Parietal bone and the temporal bone of the skull are joined by fibrous joint

• First, vertebra is axis, which articulates with the occipital condyles

• The 9th and 10th pairs of ribs are called the floating ribs

• Glenoid cavity is a depression to which the thigh bone articulates

A.

Parietal bone and the temporal bone of the skull are joined by fibrous joint

Immovable or fixed or fibrous joints are found between the skull bones. No movement occurs at these joints. So, parietal bone and the temporal bone of the skull are joined by fibrous joint. Invertebrates, the first vertebra is called petals, while the second vertebra is the axis. In humans first pairs of ribs are called true ribs; 8th and 9th and 10th  pairs of ribs are false ribs while 11th and 12th  pairs of ribs are called floating ribs.
Glenoid cavity is a socket shaped cavity in the scapula (shoulder bone) that holds the head of the humerus in a ball and socket joint.