Which statement best describes constants in an experiment?

• A. The factors that remain the same
• B. The factors you measure
• C. The variables you manipulate
• D. The results

Answer: (A)

Constants are the factors kept the same across all trials so that any observed effect can be attributed to the factor you are studying. By holding these conditions constant, you prevent other differences from influencing the outcome, making the test fair and the results reliable. In an experiment, you typically change one factor (the independent variable), measure what happens (the dependent variable), and keep other conditions unchanged as constants. So the statement that describes constants is that they are the factors that remain the same. The other ideas refer to what you measure, what you change, or the results themselves, not the things kept constant.