[Q]: Two students studied for the biology exam. Ken studied about global warming, while Hank studied about Earth's atmosphere. Which student learned less about the increasing use of coal?
****
[A]: Hank

[Q]: Tree city and Leaf city were the two biggest cities in Boulderland. Tree city burned lots of gas and other fossil fuels, while Leaf city was very protective towards its environment. Which city exposed fewer people to lung cancer?
****
[A]: Leaf

[Q]: The biologists found out that the Indian Ocean had a lower water pH than it did a decade ago, and it became acidic. The water in the Arctic ocean still had a neutral to basic pH. Which ocean has a higher content of carbon dioxide in its waters?
****
[A]: Indian

[Q]: Two islands inhabited by many species of finches went through some climatic changes during the past several years. While Park island hat wetter than average years, Boat island experienced years of drought, so many birds died. Which island had more large-beaked birds survive?
****
[A]:
Boat