Final answer:
The movement between two adjacent vertebrae is made possible by cartilage. Intervertebral discs made of fibrocartilage fill the gap between the vertebrae and strongly unite them, while still allowing for a limited amount of movement.
Step-by-step explanation:
The movement between two adjacent vertebrae is made possible by cartilage.
The joints between the articular processes of adjacent vertebrae are cartilaginous joints. These joints are joined by cartilage, which allows for a limited amount of movement between the vertebrae.
Intervertebral discs, which are made of fibrocartilage, fill the gap between the vertebrae and strongly unite them, while still allowing for a limited amount of movement. These small movements available between adjacent vertebrae sum together along the length of the vertebral column to provide for large ranges of body movements.