Choose the correct answer :
Ecological pyramids were first devised by :

Options

A. Charles Elton
B. R. Hesse
C. R.A. Lindemann
D. Justus von Liebig

Answer

To solve the question about who first devised ecological pyramids, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks who first devised ecological pyramids. This means we need to identify the person credited with creating this concept.

2. **Review the Options**: The options given are:
- A) Charles Elton
- B) Arhes
- C) Lindemann
- D) Justice von Liburg

3. **Analyze Each Option**:
- **Arhes**: Not related to ecological pyramids or ecosystems.
- **Justice von Liburg**: Also not known for contributions to ecological pyramids.
- **Lindemann**: Known for the 10% law in ecology, which relates to energy transfer but does not specifically devise ecological pyramids.
- **Charles Elton**: Recognized for his work in ecology and is credited with the concept of ecological pyramids.

4. **Identify the Correct Answer**: Since Charles Elton is the only person among the options who is directly associated with the development of ecological pyramids, he is the correct answer.

5. **Conclusion**: The correct answer is **A) Charles Elton**.