Name two important functions of the kidneys.

Explanation

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

1. **Identify the Question**: The question asks for two important functions of the kidneys.

2. **Function 1 - Excretion**: One of the primary functions of the kidneys is excretion. The kidneys filter out toxic substances produced from metabolic activities in the body. These substances include urea, uric acid, and ammonia, which are nitrogenous wastes. The kidneys excrete these wastes through urine, helping to maintain the body's internal environment.

3. **Function 2 - Homeostasis**: The second important function of the kidneys is maintaining homeostasis. This involves regulating various physiological parameters in the body, such as:
- **Body Temperature**: The kidneys help maintain a stable body temperature.
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