Problem: Greg and Paul were two neighbors. They were both into mycology. Greg researched AM fungi, while Paul studied other types of mycorrhizal fungi. Which researcher learned less about the prevalence of AM fungi at lower soil nutrient concentrations?

A: Paul

Problem: Tom and Jerry are two friends who have always had competitions with one another throughout their whole lives. Yesterday, they just finished their most unique competition so far. Each man was given a room to sit in that had several highly radioactive objects in it. The challenge was to see who would stay in the chamber longer. Tom didn't stay in his room for very long, but Jerry felt determined to win and stayed in his chamber almost the entire day. Is Jerry's chance of dying within the next year higher or lower than Tom's?

A: higher

Problem: Two space explorers are flying around through an unknown galaxy when they discover two new planets. Given that these planets have no names, the explorers decide to name them after themselves. The planet of Sarahn is currently going through a large geographic shift. Many of the continents on the planet are currently breaking apart and moving. Timon, however, has been a stable planet with no continental moving for quite awhile now. Is the volcanic crust on Sarahn more or less dense than on Timon?

A: less

Problem: David is interested in how electricity works. One day he had two electric charges to investigate, charge A and charge B - both of the charges were negative. He also had two electric fields, field C and field D. He noticed that electric charges were moving from field C to field D. If charge A and charge B are farther, would their potential energy increase or decrease?

A:
decrease