15. Desertification is caused by a combination of converging problems, including: A. overgrazing, deforestation, drought, and climate change. B. contamination of irrigation water and natural cycles. C. urban sprawl, pesticide contamination, and natural cycles. O D. famine, starvation, and biodiversity loss.​

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