The correct answer is (d) Haversian canals.

Mammalian bone differs from cartilage in the presence of Haversian canals. These canals play a crucial role in the structure and function of bone tissue.

**Bone Tissue:**
Bone is a specialized connective tissue that provides support, protection, and movement to the body. It is composed of cells, fibers, and extracellular matrix. The extracellular matrix of bone consists of collagen fibers and mineralized calcium salts, mainly calcium phosphate.

**Cartilage Tissue:**
Cartilage, on the other hand, is a flexible connective tissue that provides support and cushioning to various structures in the body. It is composed of cells called chondrocytes and a matrix that contains collagen fibers and proteoglycans.

**Haversian Canals:**
Haversian canals, also known as osteons, are a fundamental structural unit of compact bone. They are cylindrical channels that run parallel to the long axis of the bone. These canals contain blood vessels, nerves, and lymphatic vessels. The presence of Haversian canals is a distinguishing feature of mammalian bone compared to cartilage.

**Function of Haversian Canals:**
The Haversian canals in bone serve several important functions:

1. **Blood Supply:** The canals contain blood vessels that supply oxygen and nutrients to bone cells, allowing them to survive and function effectively.

2. **Nerve Supply:** Nerves also pass through the Haversian canals, providing sensory and motor innervation to the bone tissue.

3. **Remodeling:** Bone is a dynamic tissue that undergoes continuous remodeling throughout life. The Haversian canals play a crucial role in this process by allowing the passage of osteoblasts (bone-forming cells) and osteoclasts (bone-resorbing cells) to the bone surface.

4. **Communication:** The canals provide a means of communication between different regions of the bone, allowing for coordination and integration of bone function.

**Conclusion:**
In summary, mammalian bone differs from cartilage in the presence of Haversian canals. These canals serve important functions in bone, including the provision of blood and nerve supply, bone remodeling, and communication within the tissue.