Tip of the nose and external ears have

The correct answer is cartilage.

To understand why this is the case, let us look at the structure and functions of the tissue types provided in the options:
1. Cartilage: This is a specialized, semi-rigid, yet flexible connective tissue. It contains chondrocytes (cartilage cells) embedded in a firm, gel-like matrix made of proteins and fibers. Cartilage provides structural support and flexibility. It is found in areas of the body that require both support and the ability to bend or resist deformation without breaking, such as the tip of the nose, the external ears (pinna), and the joints.
2. Areolar tissue: This is a loose connective tissue that binds outer organs or tissues to underlying structures, serving as a cushion. It does not provide the firm structural shape required for the nose or ears.
3. Ligament: This is a fibrous connective tissue that connects bones to other bones. It is not designed to form structural appendages like ears or the nose.
4. Bone: This is a highly rigid, calcified connective tissue that forms the skeletal framework. If the tip of the nose or the external ears were made of bone, they would be completely hard and inflexible.

Therefore, because the tip of the nose and the external ears need to maintain their shape while remaining flexible and pliable, they are composed of cartilage (specifically, elastic cartilage in the external ear and hyaline cartilage at the nasal tip).