Name the functional and structural unit of kidney.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the functional and structural unit of the kidney. This means we need to identify what unit performs the main functions of the kidney and also contributes to its structure.

2. **Identifying the Unit**: The functional and structural unit of the kidney is called the nephron.

3. **Reason for the Name**: Nephrons are referred to as the functional unit because they are responsible for the kidney's primary function, which is the filtration of blood and the removal of waste products from the body.

...