Which of the following was not usually observed by G.F. Gause in his studies on interspecific competition?

Options

A. Species usually had higher growth rate when alone
B. Some species that grew very rapidly in a particular environment would be completely eliminated when grown with other species
C. Populations grow exponentially when alone
D. None of the above

Answer

To solve the question regarding G.F. Gause's studies on interspecific competition, we need to analyze the options provided and determine which statement was not typically observed by Gause.

### Step-by-Step Solution:

1. **Understand G.F. Gause's Studies**: Gause is known for his work on the competitive exclusion principle, which states that two species competing for the same resources cannot coexist if other ecological factors are constant. One species will outcompete the other.

2. **Evaluate the Options**:
- **Option 1**: Species usually had higher growth rates when alone.
- **Option 2**: Some species that grew very rapidly in a particular environment would be completely eliminated when grown with other species.
- **Option 3**: Population grew exponentially when alone.
- **Option 4**: This option is unclear as it seems to repeat statements about Connell's experiment rather than Gause's observations.

3. **Analyze Each Option**:
- **Option 1**: This aligns with Gause's findings, as species tend to thrive better in isolation without competition.
- **Option 2**: This is also consistent with Gause's studies, as competitive interactions can lead to the extinction of one species.
- **Option 3**: This is plausible as well; populations can exhibit exponential growth when not limited by competition.
- **Option 4**: This option does not directly relate to Gause's findings and instead discusses Connell's experiment, which is not a focus of Gause's studies.

4. **Conclusion**: The statement that does not reflect G.F. Gause's observations is **Option 4**, as it does not pertain to his studies on interspecific competition.

### Final Answer:
**Option 4**: Which of the following statements does not favor Gauss in his studies?