Stanley Miller's experiment supports

Options

A. Abiogenesis
B. Biogenesis
C. Pangenesis
D. Chemical theory

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which theory Stanley Miller's experiment supports. The options provided are biogenesis, abiogenesis, pangenesis, and the chemical theory.

2. **Define the Theories**:
- **Biogenesis**: This theory states that living organisms arise from other living organisms.
- **Abiogenesis**: This theory suggests that life can arise from non-living matter, which is the opposite of biogenesis.
- **Pangenesis**: This theory proposes that organisms can originate from spores or particles from other celestial bodies.
- **Chemical Theory**: This theory, supported by Miller's experiment, posits that organic molecules necessary for life can be formed from inorganic compounds under certain conditions.

3. **Overview of Miller's Experiment**: Stanley Miller, along with Harold Urey, conducted an experiment in 1953 to simulate the conditions of early Earth. They used a mixture of gases thought to be present in the atmosphere of early Earth (methane, ammonia, hydrogen, and water vapor) and subjected it to electrical sparks to simulate lightning.

4. **Results of the Experiment**: The experiment resulted in the formation of amino acids, which are the building blocks of proteins, and other organic compounds. This demonstrated that organic molecules could be synthesized from inorganic precursors.

5. **Conclusion**: Since Miller's experiment provided evidence that organic molecules necessary for life could be formed from inorganic substances, it supports the **Chemical Theory** of the origin of life.

6. **Final Answer**: The correct answer is **D: the chemical theory**.

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