Who proved that life on present earth can originate only from pre-existing life?

Options

A. Louis Pasteur
B. Charles Darwin
C. Boxmann
D. Weissman

Answer

To answer the question "Who proved that life on present earth can originate only from pre-existing life?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question is asking for the scientist who demonstrated that life arises from existing life, rather than from non-living matter.

2. **Identifying Key Concepts**: The concept of life originating from pre-existing life is known as "biogenesis". This is contrasted with "abiogenesis", which is the idea that life can arise from non-living matter.

3. **Reviewing the Options**: The options provided are:
- A) Lewis Pasteur
- B) Charles Darwin
- C) Boxman
- D) Weasman

4. **Analyzing Each Option**:
- **Lewis Pasteur**: He is known for his experiments that supported the theory of biogenesis. He conducted experiments that showed that microorganisms come from other microorganisms, not from spontaneous generation.
- **Charles Darwin**: He is famous for his theory of evolution and natural selection, but he did not specifically prove that life comes from pre-existing life.
- **Boxman**: This name does not correspond to a well-known scientist in this context.
- **Weasman**: This name is also not widely recognized in relation to the origin of life.

5. **Selecting the Correct Answer**: Based on the analysis, Lewis Pasteur is the scientist who proved that life on present earth can originate only from pre-existing life through his work on biogenesis.

6. **Final Answer**: The correct answer is A) Lewis Pasteur.