Enter the required number. Print the number. THE CHEST IS FORMED __ BY PAIRS OF RIBS. Answer: square

The correct answer is 12.<br /><br />The human chest is formed by 12 pairs of ribs. Each pair consists of one rib on the left side and one rib on the right side. These ribs are attached to the thoracic vertebrae in the spine and curve around to meet at the sternum in the center of the chest. The ribs play a crucial role in protecting vital organs such as the heart and lungs, as well as aiding in the process of respiration by expanding and contracting the chest cavity.