Question

everything, everything, everything, everything stays the same except ______________
the dependent variable
the independent variable
the constants

Explanation:

In an experiment, the independent variable is the one that is manipulated or changed. The dependent variable depends on the independent variable and changes as a result. Constants are factors that remain the same throughout the experiment. So, when everything else stays the same, the independent variable is the one that is altered.

Answer:

the independent variable