Some hyperthermophilic organisms that grow in highly acidic `(pH2)` habitats belong to the two groups

Options

A. Liverworts and yeasts
B. Eubacteria and archaea
C. Cyanobacteria and diatoms
D. Protists and mosses

Answer

To answer the question about hyperthermophilic organisms that thrive in highly acidic habitats, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Hyperthermophilic Organisms**:
- Hyperthermophilic organisms are those that can survive and thrive at extremely high temperatures, typically ranging from 70°C to 120°C. They are often found in extreme environments such as hot springs and hydrothermal vents.

2. **Identifying the pH Conditions**:
- These organisms can also tolerate highly acidic conditions, with a pH range of 1 to 4. This means they can survive in environments that are very acidic.

3. **Classification of Organisms**:
- The question asks for two groups of organisms that fit these criteria. We need to focus on prokaryotic organisms since they are more likely to survive extreme conditions compared to eukaryotic organisms.

4. **Evaluating the Options**:
- **Option A: Liverworts and Yeast**: These are eukaryotic organisms and are not known for surviving extreme conditions. Therefore, this option is incorrect.
- **Option B: Eubacteria and Archaea**: Both groups include prokaryotic organisms. Some eubacteria can survive high temperatures and acidic environments, and archaea are well-known for thriving in extreme conditions, including high acidity and temperature. This option is correct.
- **Option C: Cyanobacteria and Diatoms**: While cyanobacteria are prokaryotic, diatoms are eukaryotic and do not typically survive extreme conditions. This option is incorrect.
- **Option D: Protista and Mosses**: Both groups are eukaryotic and are not adapted to extreme environments. This option is incorrect.

5. **Conclusion**:
- The correct answer is **Option B: Eubacteria and Archaea**, as both groups contain organisms that can survive in highly acidic and high-temperature environments.

### Final Answer:
**Eubacteria and Archaea**

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