Bacteria which can also live in the abence of oxygen are

Options

A. Obligate aerobes
B. Facultative aerobes
C. Obligate anaerobes
D. Facultative anaerobes.

Answer

To determine the type of bacteria that can live in the absence of oxygen, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of Bacteria Based on Oxygen Requirement**:
- Bacteria can be categorized based on their oxygen requirements into aerobes and anaerobes.
- **Aerobes**: Require oxygen for survival.
- **Anaerobes**: Do not require oxygen for survival.

2. **Identify the Categories of Anaerobes**:
- Anaerobes are further divided into:
- **Obligate Anaerobes**: These bacteria cannot survive in the presence of oxygen. They strictly require an oxygen-free environment.
- **Facultative Anaerobes**: These bacteria can survive in both the presence and absence of oxygen. They can switch between aerobic and anaerobic metabolism.

3. **Analyze the Options Given**:
- **Obligate Aerobes**: Require oxygen to survive. (Not the answer)
- **Facultative Aerobes**: Prefer oxygen but can survive without it. (Not the answer)
- **Obligate Anaerobes**: Cannot survive in the presence of oxygen. (Not the answer)
- **Facultative Anaerobes**: Can survive in both the presence and absence of oxygen. (This is the answer)

4. **Conclusion**:
- The bacteria that can live in the absence of oxygen are **Facultative Anaerobes**.

### Final Answer:
**Facultative Anaerobes**

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