For each of the following research projects list at least For each of the following research…

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For each of the following research projects list at least
For each of the following research projects, list at least one area or cluster that could be used in obtaining the sample.
a. A study of road conditions in the state of Missouri
b. A study of U.S. offshore oil wells
c. A study of the environmental effects of petrochemical plants west of the Mississippi River

For each of the following research projects list at least