Which joints are classified as synovial joints?

Synovial joints are characterized by a fluid-filled joint cavity, allowing for a greater range of motion compared to other types of joints. This joint type is typically found in areas of the body that require movement, such as the elbow and knee joints. These joints have features such as articular cartilage covering the ends of the bones, a joint capsule, and synovial fluid that lubricates the joint.

The elbow and knee joints enable flexion, extension, and can also allow for additional movements such as rotation in some cases, which illustrates the dynamic functional capacity of synovial joints. In contrast, the other options presented involve joints that are either immobile or have limited movement. For instance, skull sutures are fibrous joints that provide stability to the skull, intervertebral joints are classified as cartilaginous and allow limited movement, and the pubic symphysis is also a cartilaginous joint that permits slight movement. The distinctive characteristics of synovial joints make the elbow and knee the correct answer for this question.