Which of the following is not dependent on a living system?

Options

A. Diffusion
B. Facilitated diffusion
C. Both A and B
D. None of the above

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks which of the given options is not dependent on a living system. This means we need to identify a process or mechanism that can occur independently of living organisms.

2. **Analyzing the Options**:
- **Option 1: Diffusion**: Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. This process can occur in both living and non-living systems, as it is driven by concentration gradients and does not require energy or living cells.
- **Option 2: Facilitated Diffusion**: This is a type of passive transport that requires specific transport proteins to help move substances across a cell membrane. Since it involves proteins and cell membranes, it is dependent on living systems.
- **Option 3: Both A and B**: This option suggests that both diffusion and facilitated diffusion do not depend on living systems. However, since facilitated diffusion does depend on living systems, this option is incorrect.
- **Option 4: None of the Above**: This option implies that all previous options are dependent on living systems, which is not true since diffusion can occur independently.

3. **Conclusion**: Based on the analysis, the correct answer is **Option 1: Diffusion**, as it is the only process listed that does not depend on a living system.

### Final Answer:
**The correct answer is Option 1: Diffusion.**

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