Rob is an auto mechanic. He was checking the radiators of his car and truck. He put antifreeze into the car radiator, but didn't put any antifreeze into the truck radiator. He was wondering how the vehicles would fare in coming hot weather. Which radiator's water would have lower boiling point, car or truck?
Ans: truck

Barb and Jill practiced small scale farming. Jill farmed the conventional way, while barb used the no-tillage method. Which farmer caused larger predator populations?
Ans: Barb

Two countries used different methods to produce their energy. Albania used fossil fuels, while Croatia used Nuclear fission. Which country caused more air pollution?
Ans: Albania

Two groups of students studied Biology. Group One studied mammals, while Group Two studied birds. They focused on the respiratory system. Which group of students learned less about alveoli being surrounded by a network of very small blood vessels ?
Ans: Two