Final answer:
The connective tissues that attach bone to bone and help strengthen joints are known as ligaments, which are made of fibrous tissue that includes collagen and elastin.
Step-by-step explanation:
The connective tissues that attach bone to bone and help strengthen joints are known as ligaments. Ligaments are composed of bands of fibrous connective tissue that are rich in both collagen and elastin, giving them the ability to stretch and hold skeletal bones in proper alignment. Unlike tendons, which attach muscle to bone, or cartilage, which provides a smooth surface at the ends of bones, ligaments specifically function to connect one bone to another and offer support and stability to the joints.