Stanley Miller and Harold Urey performed and experiment by recreating in the laboratory the probable conditions of the atmosphere of the primitive earth. In what forms was the energy supplied for chemical ractions to occur ?

Explanation

**Step-by-Step Solution:**

1. **Background of the Experiment**: Stanley Miller and Harold Urey conducted their famous experiment in 1953 to simulate the conditions of the early Earth and to investigate the origin of life from inorganic substances.

2. **Atmospheric Conditions**: They recreated an atmosphere that was believed to resemble that of the primitive Earth. This included gases such as methane (CH₄), ammonia (NH₃), hydrogen (H₂), and water vapor (H₂O).

3. **Energy Supply**: To facilitate chemical reactions among these gases, energy was required. In their experiment, Miller and Urey supplied energy in two main forms:
- **Electrical Energy**: They used electrodes to create electrical sparks, simulating lightning, which provided the necessary energy to drive the chemical reactions.
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