Problem: Ned learned about reactions at a higher temperature for his physics class, while Paul had to learn about reactions at lower temperatures. Which person studied about particles of reactants having more energy?

A: Ned

Problem: Two farmers, Tom and Brad, applied different farming methods. Tom tilled his land, while Brad applied the no-till gardening method. Which farmer didn't cause an increase in the predator populations?

A: Tom

Problem: The Gorge saw some negative effects due to deforestation. The Valley has a more fertile soil, it's not overgrazed, and the trees and bushes are abundant, and the productivity has increased several fold over the past decade. Biodiversity in the Valley is varied, and the soils are nutritious and retain more water, nitrogen and carbon. Which area has the most trees?

A: The Valley

Problem: Two neighboring countries had health epidemics. While Ghana had a measles problem, Niger had a very serious HIV problem that seemed to get out of control. Which country had fewer people transmitting HIV through sexual contact?

A:
Ghana