"Cartilaginous" refers to tissues made of cartilage, a flexible and resilient connective tissue found in various parts of the body. Unlike bone, cartilage is softer and provides support while allowing for movement. It is essential in areas such as the joints, nose, ears, and the ribcage, where it helps maintain structure without the rigidity of bone. In the animal kingdom, some species, like sharks and rays, are classified as cartilaginous fish. These creatures have skeletons made entirely of cartilage rather than bone, which contributes to their agility and buoyancy in water. Cartilage also plays a crucial role in human development, particularly in the growth of long bones.