Problem: Given the question: Keith was reading a book on climate. He found an interesting table that showed the climatic conditions of the earth in two different times, time A and time B. Time A showed earth's climatic condition in the previous century. And, time B showed earth's climatic condition in the present century. Keith was amazed to see how the world has changed in just a century. Which period would be more difficult for certain fish to reproduce, time A or time B?
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The answer is:
time B

Problem: Given the question: Two twin sisters, Bianca and Rosa, were exposed to high levels of air pollution. While Bianca was exposed mostly to indoor pollution, Rosa was heavily exposed to outdoor pollution. Which sister got more fresh air?
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The answer is:
Rosa

Problem: Given the question: Bob and Andy are two microbiologists. They are studying bacteria: Bob studies nitrogen fixating bacteria, while Andy studies non-respiratory and facultative anaerobes. Which researcher learned more about the enzyme nitrogenase?
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The answer is:
Bob