The concept of ecological pyramids was given by

Options

A. Darwin
B. Odum
C. Reiter
D. Elton

Answer

To solve the question regarding who proposed the concept of ecological pyramids, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks who introduced the concept of ecological pyramids. We have four options: A) Darwin, B) Odom, C) Ritter, D) Elton.

2. **Analyze Each Option**:
- **Option A: Darwin** - Charles Darwin is known for his theory of natural selection, not ecological pyramids.
- **Option B: Odom** - Eugene Odom is referred to as the father of modern ecology, but he did not specifically introduce ecological pyramids.
- **Option C: Ritter** - Ritter is associated with Reiter's syndrome, which is unrelated to ecological pyramids.
- **Option D: Elton** - Charles Elton is credited with the concept of ecological pyramids, which are also known as Eltonian pyramids.

3. **Identify the Correct Answer**: Based on the analysis, the correct answer is **Option D: Elton**.

4. **Conclusion**: The concept of ecological pyramids was given by Elton.

### Final Answer:
The concept of ecological pyramids was given by Elton (Option D).

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