The skeletal system includes- Group of answer choicesBonesCartilageLigamentsBones, cartilage, and ligaments all are part of the skeletal system

The skeletal system includes all of the following:

1. Bones: These are the rigid structures that make up the framework of the body. They provide support, protect internal organs, and facilitate movement.

2. Cartilage: This is a flexible connective tissue found in many areas of the body. It can be found in joints between bones, the rib cage, the ear, the nose, the bronchial tubes and the intervertebral discs.

3. Ligaments: These are fibrous connective tissue that connect bones to other bones. They provide stability and strength to the skeletal system.

So, the answer is "Bones, cartilage, and ligaments all are part of the skeletal system".