Which term describes an experiment conducted without variables?

• A. Hypothesis
• B. Observation
• C. Control
• D. Conclusion

Answer: (C)

When scientists design experiments, they compare what happens under different conditions by keeping most factors the same. The term for the condition where everything is kept constant and used as a baseline for comparison is the control. This control setup lets researchers see what would happen without the variable they’re testing, so any observed effect can be attributed to that specific variable. In practice, the control is the standard you compare the experimental results against. The other terms describe parts of forming or interpreting an experiment: a hypothesis is a testable guess, observation is data collection, and a conclusion is the final interpretation based on results.