Question

five students measured their pulse rates, then exercised by running up and down the stairs five times, then measured their pulse rates again. in the investigation, the independent variable is the

1. time to run up and down the stairs
2. pulse rate
3. five students who participated
4. exercise that was done

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Explanation:

In an experiment, the independent variable is the one that is manipulated or changed. Here, the students' action of running up and down the stairs (the exercise) is what is being changed (the independent variable), and it affects the pulse rate (the dependent variable).

Answer:

1. exercise that was done