Which one is example of homeostasis ?

Options

A. Osmoregulation in aquatic animals
B. Increased heart beat at running
C. Sweating during exerices and regulation of temperature
D. All the above

Answer

### Step-by-Step Solution:

1. **Understanding Homeostasis**:
- Homeostasis refers to the ability of living organisms to maintain a stable internal environment despite changes in external conditions. This includes regulating various physiological processes to ensure optimal functioning.

2. **Identifying Examples**:
- We need to analyze the options provided to see which ones exemplify homeostasis:
- **Osmoregulation in Aquatic Animals**: This is the process by which aquatic animals maintain the balance of salt and water in their bodies, which is crucial for their survival in varying external environments.
- **Increased Heartbeat at Running**: When a person runs, their body requires more oxygen. To meet this demand, the heart rate increases, ensuring that oxygen is delivered more efficiently to the muscles. This adjustment is a form of homeostasis as it helps maintain the necessary oxygen levels in the body.
- **Sweating During Exercise**: During physical exertion, the body temperature rises. Sweating helps cool the body down through evaporation, thus regulating internal temperature and maintaining homeostasis.
- **Regulation of Temperature**: This is a broader term that encompasses various mechanisms (like sweating) that organisms employ to maintain a stable internal temperature.

3. **Conclusion**:
- All the options provided (Osmoregulation, Increased Heartbeat, Sweating, and Temperature Regulation) are examples of homeostasis. Therefore, the correct answer is **"All of the above."**

### Final Answer:
- **All of the above** are examples of homeostasis.

---