Write one important function of the backbone.

Explanation

**Step-by-Step Text Solution:**

1. **Identify the Backbone:** The backbone, also known as the vertebral column, is a structure made up of individual bones called vertebrae.

2. **Composition of the Backbone:** The backbone is primarily composed of calcium carbonate, which gives it a hard and stiff nature.

3. **Main Function of the Backbone:** One of the most important functions of the backbone is to enclose and protect the spinal cord.

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