Write the scientific name of the organism Alexander Flemming worked on and discovered the first antibiotic. Was the organism he worked on a fungus or a bacterium?

Explanation

**Step-by-Step Solution:**

1. **Identify the Organism**: The organism that Alexander Fleming worked on was a bacterium known as Staphylococcus.

2. **Scientific Name**: The scientific name of the bacterium is *Staphylococcus aureus*.

3. **Observation**: Fleming observed that a mold was growing on an unwashed culture plate containing this bacterium.

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