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Biology, 27.08.2021 22:10 Brittany0512

28 A school physician performed an experiment to investigate the effects of aerobic exercise on high school freshme
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 ac
during each activity, and after each activity. Which is the independent variable in this experiment?
the students' health
B the aerobic exercise
c) the number of volunteers
D) the students' pulse rates

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