Bacteria that survive high salt concentration and temperatuer are

Options

A. Cyanobacteria
B. Archaebactera
C. Eubacteria
D. Actinomycetes.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for bacteria that can survive in high salt concentrations and high temperatures.

2. **Identifying Key Terms**:
- Bacteria that tolerate high salt concentrations are known as **halophiles**.
- Bacteria that can withstand high temperatures are referred to as **thermophiles**.

3. **Classifying Bacteria**:
- Bacteria are classified into two main groups: **Archaebacteria** and **Eubacteria**.
- **Archaebacteria** are known to include both halophiles and thermophiles, making them capable of surviving in extreme environments.

4. **Evaluating the Options**:
- **Cyanobacteria**: Incorrect, as they are a type of photosynthetic bacteria and not specifically known for surviving in extreme conditions.
- **Archaeobacteria**: Correct, as they include halophiles and thermophiles, which can survive in high salt and temperature conditions.
- **Eubacteria**: Incorrect, as they are more common and typically found in less extreme environments (e.g., E. coli in the human intestine).
- **Actinomycetes**: Incorrect, as they are soil bacteria and do not specifically thrive in high salt or temperature conditions.

5. **Conclusion**: The correct answer is **Archaeobacteria**, as they are the group of bacteria that can survive in high salt concentrations and high temperatures.

**Final Answer**: Archaeobacteria

---