Organisms found in extreme temperatures are

Options

A. Eubacteria
B. Archaebacteria
C. Fungi
D. Cyanobacteria

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:**
The question asks about organisms that are found in extreme temperatures. We need to identify which types of organisms thrive in such conditions.

2. **Identifying Organism Groups:**
We start by categorizing organisms. The two main groups we will consider are Eubacteria and Archaeobacteria.

3. **Eubacteria:**
- Eubacteria, also known as True Bacteria, are commonly found in various environments such as soil, water, and living organisms.
- However, they are not typically found in extreme habitats, so they do not fit the criteria for organisms found in extreme temperatures.

4. **Archaeobacteria:**
- Archaeobacteria, or Archaea, are known to be ancient and can survive in extreme conditions.
- They are divided into three major groups:
- **Methanogens:** These organisms produce methane and are often found in anaerobic environments.
- **Halophiles:** These thrive in highly saline environments.
- **Thermophiles:** These are specifically adapted to live in extremely high temperatures, often above 100 degrees Celsius.

5. **Conclusion:**
Based on the information, the organisms that are found in extreme temperatures are **Thermophiles**, which are a type of Archaeobacteria. Therefore, the correct answer to the question is **Archaeobacteria**, specifically the group known as Thermophiles.

**Final Answer:**
Organisms found in extreme temperatures are **Thermophiles**, a type of Archaeobacteria.

---