In 1953 S.L. Miller created primitive earth conditions in the laboratory and gave experimental evidence for origin of first form of life from pre-existing non-living. Organic molecules. The primitive earth condition created include.

Options

A. low temperature, volcanic storms, atmosphere rich in oxygen
B. low temperature, volcanic storms, reducing atmosphere
C. high temperature, voicanic storms, non-reducing atmosphere
D. high temperature, voicanic storms, non-reducing atmosphere.

Answer

### Step-by-Step Solution:

1. **Understanding the Experiment**: In 1953, S.L. Miller conducted an experiment to simulate the conditions of primitive Earth to investigate the origin of life from non-living organic molecules.

2. **Theoretical Background**: The experiment was based on the theory of chemical evolution proposed by scientists Oparin and Haldane. They suggested that before living cells could form, a variety of organic molecules needed to be created from inorganic substances present on primitive Earth.

3. **Conditions of Primitive Earth**: The conditions on primitive Earth were characterized by:
- **High Temperatures**: The experiment maintained a temperature of around 800 degrees Celsius.
- **Reducing Atmosphere**: The atmosphere lacked free oxygen (O2) and was rich in gases such as methane (CH4), ammonia (NH3), hydrogen (H2), and water vapor (H2O).
- **Unstable Climate**: The climate was unstable, with phenomena like volcanic eruptions and storms.
- **Electric Discharge**: Miller introduced electric discharge into the flask to simulate lightning, which was common in the primitive atmosphere.

4. **Experimental Setup**: Miller used a closed flask to recreate these conditions. He introduced the gases that were believed to be present in the early atmosphere and applied heat and electric discharge.

5. **Results of the Experiment**: After several days under these simulated conditions, Miller observed the formation of amino acids, which are the building blocks of proteins and essential for life.

6. **Conclusion**: The successful formation of amino acids provided experimental evidence supporting the theory of chemical evolution, indicating that life could originate from non-living organic molecules under the right conditions.

### Final Answer:
The primitive Earth conditions created by S.L. Miller included:
- High temperature (around 800 degrees Celsius)
- Reducing atmosphere (rich in methane, ammonia, hydrogen, and water vapor)
- Electric discharge (to simulate lightning)
- Unstable climatic conditions (including volcanic activity)