Urey-Miller's experiment mixture had the following except

Options

A. Methane
B. `CO_2`
C. Hydrogen
D. Water vapour

Explanation

### Step-by-Step Solution:

1. **Understanding Urey-Miller Experiment**: The Urey-Miller experiment was designed to test the chemical theory of evolution, which suggests that life originated from non-living materials through chemical processes.

2. **Components of the Primitive Atmosphere**: The experiment aimed to recreate the conditions of the primitive Earth. The gases used in the experiment included hydrogen, ammonia, methane, and water vapor.

3. **Identifying the Mixture**: In the experiment, the gases were mixed in a specific ratio (2:1:2 for methane, ammonia, and hydrogen) along with water vapor.

4. **Analyzing the Options**: The question asks which component was NOT included in the Urey-Miller experiment mixture. The options are:
- A) Methane
- B) Carbon Dioxide (CO2)
- C) Hydrogen
- D) Water Vapor

5. **Evaluating Each Option**:
- **A) Methane**: This was included in the mixture.
- **B) Carbon Dioxide (CO2)**: This was NOT included in the mixture.
- **C) Hydrogen**: This was included in the mixture.
- **D) Water Vapor**: This was included in the mixture.

6. **Conclusion**: The correct answer is **B) Carbon Dioxide (CO2)**, as it was the only component not present in the Urey-Miller experiment mixture.