Before using the survey as evidence, the writer would need to determine:
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The survey author's interests in genetically modified foods - It's important to know if the survey author has any biases or conflicts of interest that could affect the reliability of the survey.
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The methods used by the survey author to conduct the survey - Understanding the methodology helps to assess the validity and reliability of the survey results, including sample size, question wording, and how participants were selected.
These two considerations will help ensure that the evidence is credible and relevant.