Which term describes factors that do not change during an experiment?

• A. Experimental factors
• B. Conditions
• C. Constants
• D. Invariants

Answer: (C)

In experiments, the things that stay the same are called constants. These factors are kept unchanged so they don’t influence the results, letting you see how the variable you’re testing actually affects the outcome. For example, when you study how amount of sunlight affects plant growth, keeping the type of plant, soil, water level, and temperature constant means any difference in growth can be attributed to sunlight rather than those other factors. The term constants specifically describes those unchanged factors. The other ideas refer to things that can change or to the overall setup, not to the factors kept fixed. Invariants isn’t the typical lab term for this context.