Here's why:
* Joseph Priestley's Experiment: Joseph Priestley was a British chemist who conducted experiments with plants and gases in the late 1700s. He discovered that plants release a gas that could support combustion (burning).
* Oxygen's Role: This gas was later identified as oxygen, which is essential for respiration (breathing) and combustion.
* Photosynthesis: Plants produce oxygen as a byproduct of photosynthesis, the process by which they use sunlight to convert carbon dioxide and water into sugars for energy.
Therefore, the substance produced by the mint plant in Joseph's experiment was oxygen, a key discovery in the understanding of plant respiration and the role of oxygen in life.
