There is no life on moon due to the absence of :

Options

A. `O_2`
B. Water
C. Light
D. Temperature

Answer

To solve the question "There is no life on moon due to the absence of:", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the reason why there is no life on the moon. This requires us to consider the essential conditions for life.

2. **Identifying Essential Conditions for Life**: Life as we know it on Earth requires certain fundamental conditions. These include:
- Water
- Oxygen
- Suitable temperature
- Nutrients

3. **Evaluating the Moon's Environment**: The moon is known to have a very harsh environment. It lacks:
- Liquid water (though there may be ice in some permanently shadowed craters)
- A breathable atmosphere (oxygen is not available in a form that can support life)
- A stable temperature range (extreme temperatures exist on the moon)

4. **Focusing on Water**: Among the conditions listed, water is crucial for life. It is essential for biochemical reactions and is a solvent for many substances necessary for life processes. On Earth, life is believed to have originated in water.

5. **Conclusion**: Given that the moon does not have liquid water, this is the primary reason why life cannot exist there. While other factors like oxygen are important, the absence of water is the most critical reason.

6. **Final Answer**: The absence of water is the reason there is no life on the moon.