Question

1. constants (also called control variables) - uncharging factors in an experiment to isolate the effect of the variable being studied.
2. variable - a quantity or factor that can vary or change in an experiment or mathematical situation.
3. independent variable -

Explanation:

An independent variable is a variable that is manipulated or changed by the researcher in an experiment to observe its effect on the dependent variable. It is not affected by other variables in the experiment.

Answer:

A variable that is manipulated or changed by the researcher in an experiment to observe its effect on the dependent variable and is not affected by other variables in the experiment.