Which of the following statements is true of how pollutants can enter the environment from a sanitary landfill? A) Overland runoff picks up pollution and transports it into streams. B) Nitrates can easily pass through the waste and into the groundwater. C) Methane gas is produced and enters the atmosphere. D) all of the above

Ascientist is designing an investigation to study the impact of invasive bird populations on local, native bird populations at backyard bird feeders. what population is most likely to be a control group for the investigation? amount of food number of bird feeders invasive bird populations local backyard birdfeeders without food