Which area of the body would be considered an amphiarthrosis joint?

Rationale:
A. Melanin production protects against ultraviolet (UV) radiation but does not directly prevent bacterial entry.
B. Sensory perception allows detection of touch, pressure, pain, and temperature, but it does not serve as a barrier against pathogens.
C. The skin acts as a physical and chemical barrier, preventing bacteria, viruses, and other pathogens from entering the body. Its intact epidermis, along with secretions such as sweat and sebum, helps maintain this protective function.
D. Filtration is a function associated with organs like the kidneys, not the skin.

Rationale:
A. Cartilaginous joints are connected entirely by cartilage (such as the pubic symphysis or intervertebral discs). They allow limited movement but do not make up the majority of joints in the body.
B. Fibrous joints are connected by dense connective tissue and are mostly immovable (such as sutures in the skull). They are important for stability but are relatively few compared to synovial joints.
C. Synovial joints are the most numerous type in the body and allow the greatest range of motion. Examples include the shoulder, hip, knee, and elbow. They are characterized by the presence of a joint cavity filled with synovial fluid, articular cartilage, a synovial membrane, and supporting ligaments. Their structure allows movements such as gliding, rotation, flexion, extension, abduction, and adduction.
D. Synarthroses refers to immovable joints (such as sutures), which are a subset of fibrous joints. They provide stability but are not the majority type of joint in the body.