Question

An environmental agency wants to evaluate the effectiveness of rain gardens in reducing the impact of urban runoff from a

parking lot and from the roof of the building. The parking lot is slightly sloped so the rainwater flows toward the gardens. T
roof is collected by various downspouts and directed toward the gardens. Scientists at the agency plan to monitor the effe
measuring the water quality of the storm water as it moves through the gardens during and after storm events.
Which of the following would be the best control in this experimental design?
Water samples collected from a faucet inside the building
Water samples collected from the roof or parking lot before they passed through the gardens
Soil samples collected from different rain gardens on the property
Soil samples collected from under the parking lots around the city

Answer 1

As individuals move out of urban areas to nearby suburbs, the population densities of cities will decrease, reducing the spread of infectious disease.

Step-by-step explanation: