What was sealed in the spark chamber in famous Miller and Urey simulation experiment ?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Miller-Urey Experiment**: The Miller-Urey experiment was designed to simulate the conditions of early Earth to test the hypothesis of abiogenesis, which is the origin of life from non-living matter.

2. **Identifying the Spark Chamber**: In the experiment, a spark chamber was used to create conditions that mimic lightning strikes in the atmosphere of early Earth.

3. **Components Sealed in the Spark Chamber**: The following four key components were sealed in the spark chamber:
- **Methane (CH4)**: This is a simple hydrocarbon and was one of the gases believed to be present in the early atmosphere.
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