The two text structures that would best fit your essay about how major safety concerns in the food industry have been fixed over time are:
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problem and solution - This structure would allow you to identify specific safety concerns in the food industry and discuss the actions taken by historical figures to address those problems.
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sequential - This structure can help you organize the information in chronological order, detailing the timeline of safety concerns and the corresponding actions taken to remedy them over time.
These structures will help convey the evolution of food safety practices effectively.