Write a short note on bacteria.

Explanation

### Step-by-Step Solution on Bacteria

1. **Definition and Classification**:
- Bacteria are unicellular organisms, meaning they consist of a single cell.
- They are classified as prokaryotes, which means they do not have a well-defined nucleus or membrane-bound organelles.

2. **Cell Structure**:
- Bacteria have a primitive nucleus and lack complex cell structures found in eukaryotic cells.
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