All of the following conditions were present on early earth, except

Options

A. High temperature
B. Volcanic storms
C. Oxidising atmosphere
D. Reducing atmosphere.

Answer

To solve the question "All of the following conditions were present on early Earth, except," we need to analyze the options provided and understand the conditions of early Earth.

### Step-by-Step Solution:

1. **Understanding Early Earth Conditions**:
- Early Earth was formed approximately 4.5 billion years ago.
- The first life forms appeared around 3.5 billion years ago.
- There was a significant time gap between the formation of Earth and the emergence of life.

2. **Analyzing the Options**:
- **High Temperature**: Early Earth experienced high temperatures due to volcanic activity and other geological processes. This condition was indeed present.
- **Organic Compounds**: The presence of organic compounds is widely accepted in theories about the origin of life, suggesting that they were present on early Earth.
- **Oxidizing Atmosphere**: An oxidizing atmosphere is characterized by the presence of free oxygen. Early Earth did not have a significant amount of oxygen; instead, it had a reducing atmosphere.
- **Reducing Atmosphere**: A reducing atmosphere, which is low in oxygen and rich in hydrogen, was a characteristic of early Earth. This condition was present.

3. **Identifying the Incorrect Condition**:
- Among the options, the only condition that was not present on early Earth is the **oxidizing atmosphere**. Early Earth had a reducing atmosphere, which lacked free oxygen.

4. **Conclusion**:
- Therefore, the correct answer to the question is **oxidizing atmosphere**.

### Final Answer:
The condition that was not present on early Earth is **oxidizing atmosphere**.

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