________ is the Denitrifying bacteria.

Answer

**Step-by-Step Solution:**

1. **Understanding Denitrification:**
- Denitrification is the process by which nitrates (NO3-) in the soil are converted into nitrogen gas (N2), which is released into the atmosphere. This process is crucial for the nitrogen cycle and helps to maintain the balance of nitrogen in the environment.

2. **Role of Denitrifying Bacteria:**
- Denitrifying bacteria play a vital role in this process. They utilize nitrates as a source of oxygen for their respiration, leading to the conversion of nitrates into nitrogen gas.

3. **Identifying Denitrifying Bacteria:**
- Among various denitrifying bacteria, certain species are well-known for their effectiveness in this process. One of the most prominent genera of denitrifying bacteria is Pseudomonas.

4. **Specific Species:**
- Within the Pseudomonas genus, one specific species that is commonly referred to as a denitrifying bacterium is Pseudomonas aeruginosa.

5. **Conclusion:**
- Therefore, the answer to the question "______ is the Denitrifying bacteria" is **Pseudomonas aeruginosa**.

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