Researchers are evaluating the impact of the dairy farm on the Wolf River and its tributaries. They collected and analyzed the number of E coli colonies in water samples at the four locations shown in the diagram.
Which of the sample sites would serve as the control for the study?
A
B
C
D
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If researchers want to know how waste from the dairy farm is impacting human health, they would look for an increase in which disease?
Mesothelioma
Tuberculosis
SARS
Dysentery
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Which of the following explains why it can be difficult to establish a cause-and-effect relationship between pollutants and human health issues?
Human health is influenced by multiple environmental and genetic factors, making it hard to isolate the effects of a single pollutant.
Most pollutants do not remain in the environment long enough to cause long-term health effects.
The effects of pollutants are always immediate, making it easy to determine their impact.
Human body systems will excrete or eliminate any toxin soon after ingestion, making it challenging to assess their impact.
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Which of the following describes a human health impact of tropospheric ozone?
It strengthens the immune system, reducing susceptibility to respiratory infections.
It provides protection from harmful ultraviolet (UV) radiation.
It causes respiratory irritation and can worsen conditions such as asthma and bronchitis.
It has no known effects on human health since ozone is only harmful in the stratosphere.
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