Problem: Two coffee farms used different methods to grow coffee. Hill farm grown coffee conventionally, while Valley farm is into shade-grown coffee production. Which farm had more overstory trees with fairly open canopies?

A: Valley

Problem: Two farmer's associations used different agricultural methods when growing crops. Bold farm used lots of fertilizers over the years, while Shallow farm used organic methods combined with methods from permaculture. Which farm put less nitrogen into bodies of water?

A: Shallow

Problem: Two university students studied different types of drugs for their exams. Kate studied statins, while Carol studied anti-depressants. Which student learned more about an inhibitor of HMG-CoA reductase?

A: Kate

Problem: There are two rocks that scientists are looking at. Rock A is located near the lava stored in an active volcano, and rock B is outside this volcano near the base of it. The scientists are currently trying to find a way to safely transport both rocks back to a lab so they can get these rocks under a microscope to look at them. However, they are currently struggling to figure out an effective way to lift rock A out of the volcano. Are rock A's wavelengths shorter or longer than rock B's?

A:
shorter