Pollution is any undesirable change in

Options

A. physical nature
B. chemical nature
C. biological nature
D. all of these

Answer

To solve the question "Pollution is any undesirable change in", we need to analyze the options provided:

1. **Understanding Pollution**: Pollution refers to any undesirable change in the environment that can affect the physical, chemical, or biological characteristics of air, water, and land.

2. **Evaluating the Options**:
- **Option A: Physical nature** - Pollution can cause undesirable changes in the physical properties of the environment, such as temperature, texture, and appearance.
- **Option B: Chemical nature** - Pollution often involves harmful chemicals that alter the chemical composition of air, water, and soil.
- **Option C: Biological nature** - Pollution can also affect living organisms, disrupting ecosystems and harming biodiversity.
- **Option D: All of these** - Since pollution can affect physical, chemical, and biological characteristics, this option encompasses all the previous options.

3. **Conclusion**: Since pollution can indeed cause undesirable changes in all three areas mentioned (physical, chemical, and biological), the correct answer is **Option D: All of these**.

### Final Answer:
Pollution is any undesirable change in **D. All of these**.