What is considered as a landmark in the origin of life?

Explanation

**Step-by-Step Text Solution:**

1. **Identify the Landmark Event**: The question asks for a significant event in the origin of life.

2. **Reference the Experiment**: The landmark event is linked to the experiments conducted by Stanley Miller and Harold Urey, which demonstrated the synthesis of organic compounds.

3. **Highlight the Key Findings**: In their experiment, amino acids were produced under conditions that simulated the early Earth environment, particularly similar to seawater.

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