Problem: Rob is an environmental scientist. He was doing a study on agroforestry. To test the sustainability of agroforestry he conducted two pilot projects, pilot A and pilot B. In pilot A, he used a land for agrofroestry. In pilot B, he used a land for usual row-cropping. He needed to find the pros and cons of both systems. Which project would have more soil cover, pilot A or pilot B?

A: pilot A

Problem: Two neighboring towns used different approaches to agriculture. Big town used pesticides and fertilizers, while Small town applied permaculture principles and organic farming methods. Which town had fewer pesticides picked up by rain water?

A: Small

Problem: Moon and Earth were two sister planets, both inhabited by humans. People of Earth released large quantities of greenhouse gases into the atmosphere over the last decades, while Moon people were taking good care of their planet and the environment. Which planet observed an increased concentration of carbon dioxide?

A: Earth

Problem: Ben and Andy were two old friends. They both have high levels of cholesterol. Ben was prescribed cholesterol medication, while Andy didn't go to the doctor because he was careless. Which friend didn't take a drug that changed the levels of HMG-CoA reductase?

A:
Andy