Which type of connective tissue is known for providing support and flexibility at joints?

The correct answer is cartilage because it serves as a critical type of connective tissue that provides both support and flexibility at joints. Cartilage is a smooth, rubbery tissue that covers the ends of bones in joints, allowing for smooth movement and acting as a cushion to absorb shock during activities like walking or running. Its unique composition, which includes a high water content and collagen fibers, gives it the ability to resist compressive forces while still maintaining flexibility, which is essential for joint function.

In contrast, bone is a much denser and rigid connective tissue that provides structural support and protects organs but does not offer the same flexibility as cartilage. Adipose tissue, while also a type of connective tissue, serves primarily as insulation and energy storage rather than providing support or flexibility in joints. Epithelial tissue does not belong to the connective tissue category and instead functions as a protective layer covering surfaces and cavities in the body. Thus, cartilage is the only connective tissue that meets the criteria of providing support and flexibility specifically at joints.