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

Problem: The city of Reslie is known for its grilled cheese sandwiches. People come from all over the world to taste their sandwiches. The mayor of Reslie, while having a meeting about how to spend the excess funds from tourism this year, was told that the city is experiencing soil piping. The neighboring city, Tichago, consumes many of Reslie's grilled cheese sandwiches. The mayor of Tichago has just received a phone call from the mayor of Reslie asking if Tichago is also having soil piping. Tichago's mayor replies that no, they are not. Which city will need to inspect their dams less often?

A: Tichago

Problem: Over time a species of bird has changed a lot. Originally the climate the bird lived in changed so they adapted and more of them were seen to have heavy down feathers for warmth. Later down the line it got warmer, some of the birds stayed in the warmer area and adapted to it growing thinner feathers. Some of the others decided to migrate to colder areas instead. More time passed and the birds in the warmer area eventually evolved into a very dangerous creature with sharp talons to defend itself from predators. The birds that moved to the colder environment had less predators so they remained basically harmless.. Which birds is likely a case of speciation, the birds living in the cold area or the warm area?

A: warm area

Problem: John works as a mechanical engineer in the auto industry. He is testing three surfaces, surface A, surface B, and surface C for their usability. Surface A has a gentler slope, surface B has a steeper slope, and surface C doesn't have any sloping. He needs to figure out advantages and disadvantages of each slope. Would surface A need less or more input force to move an object upward?

A:
less