Who observed bacteria for the first time ?

Explanation

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks who observed bacteria for the first time.

2. **Recall Historical Context**: To answer this question, we need to think about the history of microbiology and significant figures in this field.

3. **Identify the Key Figure**: The person who is credited with the first observation of bacteria is Anton von Leeuwenhoek.

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