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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03-10-2021
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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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fichoh fichoh · Answer 1 · 2021-10-12T02:37:57-04:00

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.

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