The curve below shows the percentage of population of aquatic species that die in response to doses of pollutant A, a toxic substance. A local manufacturing plant reports a spill that released pollutant A into the local watershed. Local officials must determine if the residents should be evacuated from the area. Initial groundwater samples show pollutant levels at 20 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.

b

explanation:

you know that this symptom is misleading and quite often is related to: heart attack

a heart attack is a condition that occurs when the blood flow that transports oxygen to the heart muscle is damaged or cut off completely. the coronary arteries that supply the heart muscle with blood flow can be blocked by the accumulation of plaque. also, when the plaque within the heart artery breaks, it creates blood clot that can also hinder the blood flow. men that are over 45years of age and women that are over 55years of age are at risk of having a heart attack. the symptoms of a heart attack include chest discomfort, chest pain, coughing, and shortness of breath.

potentially fatal issues such as heart attacks and strokes

explanation:

i think the correct answer from the choices listed above is option c. the statement that is correct about   the cave and geyser would be that the cave is formed when groundwater reacts with the limestone in rocks and the geyser is formed when groundwater gets heated. hope this answers the questio