select incorrect statement w.r.t. Mac Arthur experiment on five closely related species of warblers.

Options

A. they were living together on the same tree
B. they were able to avoid competition
C. David unable to promote coexistence
D. they enhance their rate of Survival by changing foraging patterns

Answer

To solve the question regarding the incorrect statement related to MacArthur's experiment on five closely related species of warblers, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Experiment**: MacArthur's experiment focused on five closely related species of warblers that were observed living in the same tree. The aim was to study how these species co-existed without competing for the same resources.

**Hint**: Recall that MacArthur's experiment was about species co-existence in the same habitat.

2. **Analyze the Statements**: We need to evaluate each statement provided in the question to determine which one is incorrect.

- **Statement 1**: "They were living together on the same tree."
- This is correct. The warblers were indeed observed living together on the same tree.

**Hint**: Think about the physical environment where the warblers were studied.

- **Statement 2**: "They were able to avoid competition."
- This is also correct. The warblers occupied different strata of the tree, which allowed them to avoid direct competition for food and nesting sites.

**Hint**: Consider how different layers of a tree can provide different resources.

- **Statement 3**: "Devils unable to promote co-existence."
- This statement is incorrect. The essence of MacArthur's experiment was to demonstrate how these species could coexist without competition, which contradicts the statement.

**Hint**: Reflect on the main conclusion of MacArthur's study regarding species co-existence.

- **Statement 4**: "They enhance their rate of survival by changing foraging patterns."
- This statement is correct. The warblers adapted their foraging strategies based on their specific strata, which enhanced their survival.

**Hint**: Think about how adaptation can lead to better survival rates in a shared habitat.

3. **Identify the Incorrect Statement**: Based on the analysis, the incorrect statement is the third one: "Devils unable to promote co-existence."

**Hint**: Focus on the core findings of the experiment regarding species interactions.

### Conclusion:
The incorrect statement with respect to MacArthur's experiment on five closely related species of warblers is: "Devils unable to promote co-existence."