Explain Oparin - Haldane theory of chemical evolution of life.

Explanation

### Step-by-Step Solution:

1. **Introduction to Oparin-Haldane Theory**:
- The Oparin-Haldane theory, proposed by Alexander Oparin and J.B.S. Haldane, explains the chemical evolution of life on Earth. It suggests that life originated from simple inorganic substances through a series of chemical reactions.

**Hint**: Remember that this theory combines the ideas of two scientists and focuses on the transition from inorganic to organic life.

2. **Reducing Environment**:
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