catwinz6556 catwinz6556

14-03-2024
Biology

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A researcher gave a questionnaire on past exposures to pesticide to a group of people who had recently been diagnosed with pancreatic cancer and to another group of people who were cancer free. This is an example of a/an ________.
1) Cross-sectional study
2) Ecological study
3) Case-control study
4) Retrospective cohort study
5) Prospective cohort study

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