Amphiarthroses joints are primarily connected by what type of tissue?

Amphiarthroses joints are primarily connected by cartilage, which is why this choice is the correct answer. These joints allow for limited movement and provide some flexibility while maintaining stability between the bones. The cartilage in amphiarthroses joints serves as a cushion and allows slight gliding or compression, which facilitates the functions of joints like the pubic symphysis and the intervertebral discs in the spine.

Fibrous tissue, while involved in other types of joints such as synarthroses (which are immovable), does not provide the necessary flexibility that amphiarthroses require. Similarly, fluid is typically found in synovial joints to lubricate the joint surfaces but does not serve a structural role in connecting the bones. Bone itself is solid and does not connect joints; rather, it is the structure that makes up the skeleton. Hence, cartilage is the appropriate and defining connective tissue for amphiarthroses joints, allowing for their specific characteristics and functionalities.