Problem: The marine biologists studied two areas of the Black Sea. Area A, situated at the mouth of the Danube River, which presented high levels of water stratification, because of the fresh water discharged by the river; and area B, situated 35 miles south, where the water was less stratified and more oxygenated. Given the paragraph above, please answer correctly the following question: Which of the two areas was more oxygenated?

A: area B

Problem: Dr. Jones studied 2 groups of people to see the effects of aging on humans. Group A had people under 35 years old in it, while group B had people over 65. Given the paragraph above, please answer correctly the following question: Which group had a greater decline in stamina?

A: group B

Problem: Two identical planets, Norlon and Bothar, have been discovered in a neighboring galaxy of ours. These two planets have the same type of atmosphere as Earth and are extremely similar to Earth in terms of topography and even species of animals that live on them. The main difference is that Norlon is inhabited by a species very similar to humans that emit a lot of carbon dioxide into the atmosphere. Bothar, however, has no such species on its planet. Given the paragraph above, please answer correctly the following question: Which new planet has a cooler atmosphere?

A: Bothar

Problem: Ben visited two states. Washington state, which had many wildfires year-round, and Oregon, state which had almost no wildfires. Ben enjoyed the visit and planned to return. Given the paragraph above, please answer correctly the following question: Which state had more people inhaling carbon dioxide from the wildfire smoke?

A:
Washington