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Use the graph below to determine the range of values in which the threshold level of this pollutant lies. Dose-response curve shows ten percent of the population died when exposed to thirty milligrams of pollutant A per kilogram of water. Twenty percent of the population died when exposed to thirty-eight milligrams of pollutant A per kilogram of water. Forty percent of the population died when exposed to forty-two milligrams of pollutant A per kilogram of water. Fifty percent of the population died when exposed to forty-five milligrams of pollutant A per kilogram of water. One hundred percent of the population died when exposed to one hundred milligrams of pollutant A per kilogram of water. Between 0 and 10 mg/kg Between 10 and 20 mg/kg Between 40 and 50 mg/kg Between 50 and 60 mg/kg

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The threshold level of the pollutant marks the range of concentration of pollutant A below which the effect of the pollutant is insignificant.

  • From the graph, the threshold level of the pollutant will be the range of concentration in which the percentage population death recorded is almost equal to 0.

  • Using the information on the graph, concentration of pollutant A between 0 - 10 mg/kg have 0 - 1% population death. Hence, concentration of pollutant A poses an almost insignificant threat at this range.

  • Higher concentration levels results in increased percentage population death and the trend continues.

Therefore, the threshold level of the pollutant lies between the concentration range of 0 - 10mg/kg.

Learn more :https://brainly.com/question/13989386?referrer=searchResults

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