Abiogenesis is

Options

A. Origin of life from non-living organisms
B. Origin of microbes from living organisms
C. Spontaneous generation
D. Origin of microbes and viruses.

Answer

**Step-by-Step Text Solution:**

1. **Understanding Abiogenesis**: Abiogenesis refers to the process by which life arises naturally from non-living matter. This concept is central to the study of the origin of life on Earth.

2. **Identifying the Correct Definition**: Among the options provided:
- The first option states "origin of life from non-living organism." This aligns with the definition of abiogenesis.
- The second option mentions "origin of microbes from living organism," which refers to biogenesis, not abiogenesis.
- The third option, "spontaneous generation," is a historical concept that has been largely discredited and is not synonymous with abiogenesis.
- The fourth option, "origin of microbes and viruses," does not accurately describe abiogenesis.

3. **Conclusion**: The correct answer is the first option: "origin of life from non-living organism." This reflects the theory of abiogenesis, which suggests that life emerged from non-living chemical compounds approximately 3.5 billion years ago.

4. **Final Answer**: Therefore, abiogenesis is defined as the origin of life from non-living organisms.

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