I believe the answer is a i hope i helped
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I believe the answer is: No, this does not need to be reported since it is unrelated to participation in the study.
Unless a person is induced with chemical substance, The cause of heart attack is most likely diet and lifestyle that has been building up over time.
Since the research is revolved around attitudes towards hygiene and disease prevention, they would only observe the subject's behaviour, not making them digesting any substance.
Is participating in a demonstration what, I need more.
Answer:
rio de janeiro is a city in brazil
Explanation: