Explanation:

- Option 1: Kidney

- Kidneys are part of the urinary system, not related to vertebrae. They help filter waste from the blood and produce urine.

- Option 2: Lungs

- Lungs belong to the respiratory system. They are responsible for the exchange of oxygen and carbon dioxide and have no connection to vertebrae.

- Option 3: Heart

- The heart is central to the circulatory system, pumping blood throughout the body. It does not involve vertebrae.

- Option 4: Spinal cord

- Vertebrae are part of the musculoskeletal system that encloses and protects the spinal cord. They form the backbone and support the body’s structure.