The central nervous system comprises _______and ________ .

Explanation

**Step-by-Step Solution:**

1. **Understanding the Central Nervous System (CNS):** The central nervous system is a crucial part of the human body that plays a key role in processing information and coordinating activities.

2. **Identifying Components of the CNS:** The two main components that make up the central nervous system are the brain and the spinal cord.

3. **Final Answer:** Therefore, the central nervous system comprises **brain** and **spinal cord**.

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