Problem: Two researches studied living organisms, Joe studied eukaryotes, while Bill studied prokaryotes. They were fascinated by genetic variation. Which researcher observed more cells "grab" stray pieces of DNA from their environment?

A: Bill

Problem: Two sister countries used petroleum in different ways. Norway used it to make plastics, while Sweden used it for fuel. Which country used more fuel to power cars?

A: Sweden

Problem: Two neighboring towns had different demographics. Hill town had younger inhabitants, most of them in their 30's and 40's. Lake town was inhabited by elderly people, most of them above 65 years of age. Which town had fewer people that freed up time for their hobbies?

A: Hill

Problem: David was interested in climate change issues. He realized that to understand climate change issues he first needed to distinguish between the terms weather and climate. To that end, he labeled weather as term A. Then he labeled climate as term B. He found it easier to understand their differences in that way. Which changes less frequently, term A or term B?

A:
term B