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Chemistry, 15.07.2019 07:00 angeline2004
Shari is trying to determine how music affects a person’s pulse rate. she has her mother listen to classic rock at a high volume for 30 minutes, her younger brother listen to classical music quietly while he sleeps at night, and her grandmother listen to two hours of rap at a medium volume. she records each person’s pulse before and after listening to the music. what is missing from shari’s scientific investigation?
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