I think you forgot to give the options along with the question. i am answering the question based on my knowledge and research. The environmental parameters that city officials should investigate before purchasing the needed land is the depth <span>of groundwater and distance to local lakes, rivers, and farms.</span>
Answer: group 4
Explanation: A control act as a check in an experiment. The no caffeine group will be use to test by comparing the other groups against it. It helps exclude experimental errors and experimental bias. It help reduce the effect of the other variables on the independent variable