The conclusions of science depend on experiments.
Experiments are constant attempts to establish the correctness or fallacy of thoughts and ideas.
Thus, experimentation is the way science attempts to settle controversy. When well-designed experiments are performed and analyzed, the controversy may be settled. But the new knowledge derived from well-run experiments also engenders new controversy, and this becomes a part of the creative growth of science. The history of science knows scores of instances where an investigator was in the possession of all the important facts for a new theory but simply failed to ask the right questions. Ernst Mayr High concentrations of ozone near ground level can be harmful to people, animals, crops, and other materials.