Living beings are made up of cells. This was first stated by

Options

A. Lamarck
B. Von Helmont
C. Schleiden and Sachwann
D. Hugo de Vires

Answer

To answer the question "Living beings are made up of cells. This was first stated by," we need to identify the correct scientist or group of scientists who formulated this idea.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the origin of the statement that living beings are made up of cells. This is a fundamental concept in biology known as the cell theory.

2. **Identifying the Options**: The options given are:
- A. Lamarck
- B. Von Helmont
- C. Schleiden and Schwann
- D. Hugo de Vries

3. **Recalling the Cell Theory**: The cell theory was developed in the 19th century. It states that:
- All living organisms are composed of one or more cells.
- The cell is the basic unit of life.
- All cells arise from pre-existing cells.

4. **Researching the Scientists**:
- **Lamarck**: Known for his theories on evolution, not specifically on cells.
- **Von Helmont**: Known for his work in plant physiology, but not specifically for the cell theory.
- **Schleiden and Schwann**: In 1838 and 1839, respectively, they proposed that all plants and animals are made of cells, which is a key part of cell theory.
- **Hugo de Vries**: Known for his work in genetics, not directly related to the cell theory.

5. **Conclusion**: Since Schleiden and Schwann were the scientists who formulated the cell theory, the correct answer is **C. Schleiden and Schwann**.

### Final Answer:
The statement that living beings are made up of cells was first stated by **C. Schleiden and Schwann**.

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