Gause's law is true only when

Options

A. resources re limited
B. resources are unlimited
C. predator are limited
D. predator are limited

Answer

To solve the question regarding Gause's law, we need to understand the context of the competitive exclusion principle. Here is a step-by-step breakdown of the solution:

### Step-by-Step Solution:

1. **Understanding Gause's Law**: Gause's law, also known as the competitive exclusion principle, states that two species competing for the same limited resources cannot coexist indefinitely. One species will outcompete the other, leading to the extinction of the less competitive species.

2. **Identifying the Conditions**: The principle applies specifically to closely related species that are competing for the same resources, such as food, space, or other necessities for survival.

3. **Evaluating the Options**:
- **A. Resources are limited**: This condition aligns with Gause's law because limited resources create competition, leading to the exclusion of the less competitive species.
- **B. Resources are unlimited**: If resources are unlimited, there would be no competition, and both species could coexist, contradicting Gause's law.
- **C. Predators are limited**: The presence or absence of predators does not directly relate to the competition between two species for resources.
- **D. Predators are unlimited**: Similar to option C, this does not directly affect the competition for resources between two species.

4. **Conclusion**: Based on the analysis, Gause's law is true only when resources are limited. Therefore, the correct answer is **A. Resources are limited**.

### Final Answer:
Gause's law is true only when **A. Resources are limited**.

---