An uncontrolled experiment is typically best when it is difficult or impractical to control all variables, and the goal is to observe natural occurrences or effects in a complex system. Among the options provided, the best example of when an uncontrolled experiment might be appropriate is:
When working with the human body.
In this context, individual biological responses can vary widely due to numerous uncontrollable factors (like genetics, environment, lifestyle), making controlled experiments challenging. Observational studies can therefore provide meaningful insights without strict control of all variables.
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