Which is not a feature of all living organisms?

Options

A. Metabolism
B. Cellular organisation
C. Self-consciousness
D. Consciousness

Explanation

To determine which feature is not present in all living organisms, we need to analyze each option provided:

1. **Metabolism**:
- Metabolism refers to the sum of all chemical reactions that occur within a living organism to maintain life. This includes processes like energy production, growth, and waste elimination. All living organisms, from the simplest bacteria to complex mammals, exhibit metabolic processes.
- **Conclusion**: Metabolism is a feature of all living organisms.

2. **Cellular Organization**:
- Cellular organization refers to the structural arrangement of cells in an organism. All living organisms are composed of one or more cells, which are the basic units of life. This includes unicellular organisms (like bacteria) and multicellular organisms (like plants and animals).
- **Conclusion**: Cellular organization is a feature of all living organisms.

3. **Self-Consciousness**:
- Self-consciousness is the awareness of oneself as an individual, especially in relation to others. This trait is primarily associated with humans and some higher primates. It is not a characteristic found in all living organisms, as many organisms do not possess the capability for self-awareness.
- **Conclusion**: Self-consciousness is not a feature of all living organisms.

4. **Consciousness**:
- Consciousness refers to the state of being aware of and able to think about one's own existence, thoughts, and surroundings. While the level of consciousness varies among different organisms, basic forms of consciousness (such as responsiveness to stimuli) are present in many living organisms, including plants and animals.
- **Conclusion**: Consciousness is a feature of all living organisms.

Based on the analysis above, the feature that is not present in all living organisms is **self-consciousness**.

### Final Answer:
**Self-consciousness** is not a feature of all living organisms.