Bacteria : Prokaryote : Paramecium.........

Explanation

**Step-by-Step Solution:**

1. **Identify the Classification of Bacteria:**
- Bacteria are classified under the Kingdom Monera. They are unicellular organisms and are characterized as prokaryotes, meaning they lack a well-defined nucleus and membrane-bound organelles.

2. **Understand Prokaryotes:**
- Prokaryotes are organisms whose cells do not have a nucleus or other membrane-bound organelles. They are generally simpler in structure compared to eukaryotes.

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