Which is true of the endoskeleton of a mammal?

The endoskeleton of a mammal is composed primarily of bone and cartilage, providing structural support and protection for vital organs. It facilitates movement by serving as an attachment point for muscles and allows for growth throughout the organism's life. Additionally, the mammalian endoskeleton is characterized by a unique arrangement of bones, including the development of a vertebral column, which supports the body and houses the spinal cord. Overall, the endoskeleton plays a crucial role in a mammal's anatomy and functionality.