Who confirmed communities with more species tend to be more stable than those with less species ?
(a) Alexander von Humboldt
(b) David Tilman
(c) Paul Ehrlich
(d) Edward Wilson

Options

A. Alexander von Humboldt
B. David Tilman
C. Paul Ehrlich
D. Edward Wilson

Explanation

To solve the question of who confirmed that communities with more species tend to be more stable than those with fewer species, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Question**: The question asks which scientist confirmed that communities with more species are more stable compared to those with fewer species.

2. **Review the Options**: The options provided are:
- (a) Alexander von Humboldt
- (b) David Tilman
- (c) Paul Ehrlich
- (d) Edward Wilson

3. **Recall Relevant Information**:
- Alexander von Humboldt was known for his contributions to biogeography and ecology but did not specifically focus on species stability.
- Paul Ehrlich is known for his work in conservation biology and the study of biodiversity but did not specifically address the stability of communities based on species richness.
- Edward Wilson is well-known for his work in biodiversity and sociobiology but did not specifically confirm the relationship between species richness and community stability.

4. **Focus on David Tilman**:
- David Tilman is an ecologist who conducted significant research on the relationship between biodiversity and ecosystem stability. He found that communities with a greater number of species tend to be more stable because they can better utilize resources and maintain ecological balance.

5. **Conclusion**: Based on the information, the correct answer is (b) David Tilman, as he was the one who confirmed that communities with more species tend to be more stable.

### Final Answer:
(b) David Tilman

---