Refer to the Graph Below Showing the Results of a Study

question 194

Multiple Choice

Refer to the graph below showing the results of a study that exposed male frogs to atrazine, a chemical used in killing weeds in agricultural areas. According to the data in the graph, higher atrazine concentrations do not result in a higher rate of gonadal abnormality.Which conclusion can be drawn from these results?

• A) Low levels of atrazine are not as dangerous to amphibians as high levels of atrazine.
• B) A dosage of 15 ppb would cause a rate of abnormality between the one caused by the 0.1 ppb dosage and the one caused by the 25 ppb dosage.
• C) The effect of the atrazine exposure is not proportional to the level of exposure.
• D) Atrazine is only hazardous in a natural ecosystem, where it is naturally diluted in the waterways.
• E) Atrazine usage should be banned.

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