Problem: Henry and Tiffany are performing chemical reactions in their high school chemistry class. Henry performs his reactions with the use of a catalyst. Tiffany performs the same reaction with no catalyst present. Which person's reactions will occur at a slower rate?

A: Tiffany

Problem: Two teams of meteorologists studied environmental changes in Antarctica. Team A studied East Antarctica, while team B studied West Antarctica. They published their findings in a peer reviewed publication. Which team didn't note a warming up in the Antarctic Peninsula?

A: team B

Problem: Two teams were competing in a 5 km race. White team warmed up before the race, but Blue team arrived with a bus late and didn't have time to warm up properly before the race. Which team had fewer athletes with increased blood flow to the muscles before the race?

A: Blue

Problem: Robert and his brother Jeff are both farmers whose farms are near large rivers. These rivers eventually flow into the Pacific Ocean. Robert recently switched to a different brand of fertilizer to increase the yield on his crops. This fertilizer contains a chemical that tends to destroy oxygen when it comes into contact with it. Due to heavy rains on his farm, large amounts of this fertilizer have been leaking into the river near Robert's farm. Meanwhile, Jeff uses fertilizer that is very stable and does not leak into the rivers near his farm. Who will contribute less to the formation of dead zones in the Pacific Ocean?

A:
Jeff