Which statement best describes why regulators who set human exposure levels for toxic substances usually divide the results to ensure a margin of safety?

Question

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Regulators divide human exposure levels for toxic substances to ensure a margin of safety because the results of risk analysis are uncertain. There may be unknown factors or individual differences that could make a substance more toxic to some people than others. Dividing the exposure level provides a buffer to protect against these uncertainties.

Which Statement Best Describes Why Regulators Who Set Human Exposure