Which of the following first explained that new cells are formed from pre existing cells (omnis cellula-e-cellula)?

Options

A. Robert Hooke
B. Robert Brown
C. Rudolf virchow
D. Scheiden

Answer

To answer the question "Which of the following first explained that new cells are formed from pre-existing cells (omnis cellula-e-cellula)?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Concept**: The phrase "omnis cellula-e-cellula" translates to "every cell from a cell," which means that new cells arise from existing cells. This is a fundamental concept in cell biology.

2. **Identifying Key Scientists**: The question requires us to identify the scientist who first articulated this concept. We need to consider historical figures in cell biology.

3. **Reviewing Contributions**:
- **Robert Hooke** (1665): Known for discovering and naming cells by observing cork under a microscope. However, he did not explain the formation of new cells from existing ones.
- **Robert Brown**: Discovered the nucleus but did not contribute to the concept of cell division or the formation of new cells.
- **Schleiden and Schwann**: Together, they proposed the cell theory, stating that all living organisms are composed of cells, but they did not specifically address the formation of new cells from existing ones.
- **Rodolphe Virchow**: He is credited with the statement "omnis cellula-e-cellula," emphasizing that all cells arise from pre-existing cells.

4. **Conclusion**: Based on the contributions of these scientists, Rodolphe Virchow is the one who first explained that new cells are formed from pre-existing cells.

### Final Answer:
Rodolphe Virchow

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