The curve below shows the percentage of population of aquatic species that die in response to doses of pollutant A:

A local manufacturing plant reports a spill that released pollutant A into the local watershed. Pollutant A is a toxic substance. Local officials must determine if the residents should be evacuated from the area. Initial groundwater samples show pollutant levels at 45 mg/kg of water. Which decision is supported by the empirical evidence provided by the dose-response curve?

Evacuation is not needed; continue groundwater monitoring.
Residents should be evacuated until levels decrease.
The spill no longer needs to be monitored.
Residents should only evacuate above LD50.

No need for evacuation, continue groundwater monitoring because the dose of toxic substance in a normal or safe range. In this range the toxic substance can't affect the health of people who drink that water.

If the dose of toxic substance increases more than 10 mg/ kg then the toxic substance killed people who drink that water. According to the graph, we can see that the dose is in a normal range so we can conclude that no need of evacuation for the people.

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Kyoriigo Kyoriigo · Answer 2

Answer:

your answer would be B because the dots keep going higher while so do the numbers, it's trial and error in this question. It is already above LD50 so that is out of our way, the spill no longer needs to be monitored is out of our way because it keeps going higher so that is not an option, Evacuation is not needed; continue groundwater monitoring is the last to be out of our way, evacuation is needed in this situation.

Explanation:

Glad I could be used of use in this question !!

I also took the test so do make sure if u see a question formatted like this one do process of elimination, it helps a lot !!