Biology, 13.11.2020 23:00 loredohome
A school physician performed an experiment to investigate the effects of aerobic exercise on high school freshmen. He
examined 25 student volunteers and found them to be in good health. He then had the students perform aerobic
exercises, such as jogging, swimming, and bicycling. The doctor recorded the students' pulse rates before each activity,
during each activity, and after each activity. Which is the independent variable in this experiment?
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