Biology, 12.01.2021 20:20 Serenaark2834

The scientist wants to investigate the mechanism that causes heart rate and and respiratory rate to increase. Which of these variables could be decreased to observe an increase in both heart rate and respiratory rate?
O amount of oxygen in the air
amount of time on the treadmill
O number of subjects in the study
O size of the room

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The scientist wants to investigate the mechanism that causes heart rate and and respiratory rate to...