What fibrous tissue primarily connects bone to bone?

The correct choice is ligament because ligaments are specifically composed of dense connective tissue that serves to connect one bone to another. This allows for stability within joints while still maintaining a certain degree of flexibility, which is crucial for the proper functioning of the skeletal system during movement and weight-bearing activities.

Ligaments play a vital role in maintaining the structural integrity of joints by preventing excessive movement that could lead to injuries, such as dislocations. They are located around joints and are adapted to withstand the tension of forces applied during various activities.

In contrast, tendons connect muscles to bones and facilitate movement, cartilage provides cushioning at the joints and allows for smooth movement between bones, and fascia is a type of connective tissue that surrounds muscles and organs, offering support and protection but not linking bones directly.