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Answer:
Questionnaires
Explanation:
They allow both government and outside researchers to obtain estimates of a variety of health related topic or issue among either the entire nation or specific demographic group of the population.
And the survey design is cross section.
.60 x .40 = .24 so the patient has a 24% chance of surviving the surgery and the damage healing
The correct answer is A) Regular participation in physical activity reduces the risk of developing various diseases.