A Scientist Is Studying Air Pollution in a Large City

Multiple Choice

A scientist is studying air pollution in a large city. She creates a model to study the various variables involved such as population, the amount and types of cars driven, the use of public transportation, and temperature. What is the main advantage of the scientist's use of a model in this experiment?

A) She will be able to show the scientific community that the model is effective.
B) She can change many variables at once in order to see how they interact with each other.
C) She will be able to measure each continuous variable with perfect precision.
D) She can change one variable and observe the response of the system.
E) She will have an experiment with no uncertainty when the study is completed.