The two text structures that would best fit your essay on major safety concerns in the food industry and the actions taken by historical figures are:
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sequential - This structure will allow you to outline the timeline of events and changes that occurred over time in the food industry.
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problem and solution - This structure will enable you to highlight specific safety issues that were prevalent at certain points in history and the solutions that were implemented by the historical figures you are discussing.
These structures will effectively convey how safety concerns have been addressed and resolved over time.