Oparin and Haldane proposed:

Options

A. Theory of natural selection
B. That mutation caused speciation
C. That migration affects genetic equillibrium
D. That organic molecules could be formed abiogenic material in the presence of external energy source

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the proposals made by Oparin and Haldane regarding the origin of life. We need to identify which of the given options aligns with their theory.

2. **Reviewing the Options**:
- Option 1: First theory of natural selection
- Option 2: Mutation post speciation
- Option 3: Migration affects genetic equilibrium
- Option 4: Organic molecules could be formed from abiogenic material in the presence of an external energy source

3. **Identifying Oparin and Haldane's Theory**: Oparin and Haldane proposed that organic molecules could be formed from inorganic (abiogenic) materials when subjected to an external energy source. This theory is significant in explaining the origin of life on Earth.

4. **Evaluating Each Option**:
- Option 1 is related to Darwin's theory of evolution, not Oparin and Haldane.
- Option 2 refers to genetic mutations and speciation, which is not relevant to their proposal.
- Option 3 discusses genetic equilibrium, which is unrelated to the origin of life.
- Option 4 aligns perfectly with Oparin and Haldane's hypothesis.

5. **Conclusion**: The correct answer is Option 4: "Organic molecules could be formed from abiogenic material in the presence of an external energy source."

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