Historically, which of the following considerations in setting standards for toxic exposure has been emphasized the least?
A. Different members of the population have different sensitivities to toxins
B. Individuals in the human population have been exposed to many different kinds of toxins that may have additive or synergistic effects
C. Including information about how toxins affect natural ecological systems
D. Including information about both chronic and acute exposures to a toxin
E. All of these considerations have been used and are important in setting policy
Answer: C
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