Question

what is the purpose of maintaining constants within an experiment?
to introduce variability
to ensure consistency in all trials
to manipulate the results

Explanation:

Constants in an experiment are factors that are kept the same throughout all trials. This helps in isolating the effect of the independent variable on the dependent variable. By maintaining consistency in non - variable factors, any changes in the outcome can be more accurately attributed to the variable being tested.

Answer:

to ensure consistency in all trials