A student is investigating the question "Which increases a person's breathing rate more after three minutes, lifting five-pound
weights or lifting ten-pound weights? She designs an experiment to test the question. Which statement most likely describes
the dependent variable in her experiment?
O The breathing rate is the dependent variable because it can be affected by varying weights.
O She cannot measure the dependent variable until she finishes the experiment.
The time of exercising is the dependent variable because it can be measured.
O The five- and ten-pound weights are the dependent variable because they can affect the breathing rate.
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