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  1. Observation: Fleming noticed that a mold was killing bacteria in a petri dish left open near a window.
  2. Hypothesis: He hypothesized that the mold was releasing a substance that was inhibiting bacterial growth.
  3. Experimentation: Fleming conducted experiments to isolate and identify the substance produced by the mold.
  4. Conclusion: He found that the substance, penicillin, effectively killed bacteria, leading to the discovery of the first antibiotic.
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AnswerBot

1y ago

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