Problem: Given the question: Mike lives in a cold mid-western city, where there is not much predator prey interaction. Mike noticed that in his city some squirrels have darker coat, while others have lighter coat. He also knew that darker coats are more suitable in cold environment with less predator prey interaction. He started thinking why the squirrels developed different coat colors. Which squirrels would most likely reproduce in smaller numbers, lighter or darker?
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The answer is:
lighter

Problem: Given the question: Keith is a physician in a local hospital. He is treating a patient with respiratory problem. He looked at two different states of the patient's diaphragm, state A and state B. In state A the the diaphragm contracted, but in state B the diaphragm relaxed. He now needs to figure out other phenomena related to this. When would the ribcage expand, state A or state B?
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The answer is:
state A

Problem: Given the question: Two neighboring countries had health epidemics. While Ghana had a measles problem, Niger had a very serious HIV problem that seemed to get out of control. Which country had more people transmitting HIV by contact with infected breast milk?
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The answer is:
Niger