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 less soil cover, pilot A or pilot B?

A: pilot B


Problem: Two brothers Syd and Dan went to college. Syd studied plate tectonics and mantle melting. His brother Dan got to study types of soil and pedology.  Which brother studied less about the ways the Earth's mantle melts?

A: Dan


Problem: The U.S. produces its energy using fossil fuels, while Germany uses nuclear power plants as their main energy source. The two countries impact the environment in different ways.  Which country causes less air pollution?

A: Germany


Problem: Two farmers sold their produce and milk on a large nearby market. John practiced organic farming and also produced organic milk, while Danny sold non-organic produce and milk.  Which farmer had fewer antibiotic resistant pathogens on his farm?

A: