Problem: Given the question: Bill was studying the states of matter. First, he selected a matter with low boiling point. He labeled it as matter A. To compare it with a well-known matter he selected water. He labeled it as matter B. He also selected ice, which he labeled as matter C. He is now better prepared to compare their states. Which would have higher density, matter B or matter C?
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The answer is:
matter B

Problem: Given the question: John has been hearing about climate change for last couple of years. He wants to understand the science behind climate change. For that, he picked up two eras in earth's history, era A and era B. Era A was hundred thousand years ago, and era B is in the present day. He now wants to compare these to eras to understand the change in climate better. Would era A have more or less carbon dioxide in the air than era B?
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The answer is:
less

Problem: Given the question: Two friends read about respiratory systems. Paul read more about the lungs of mammals, while Pete read more about the lungs of frogs. Which student read more about the total surface area for gas exchange?
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The answer is:
Paul