Biology, 29.01.2020 13:48 needhelpwithHW10
Astudent is testing to see how exercise affects heart rate. one group of students sits without exercising; one group of students runs; and one group of students swims. all students have their heart rates measured immediately before and after the session. is this a controlled or comparison experiment?
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Astudent is testing to see how exercise affects heart rate. one group of students sits without exerc...
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