A scientist is in the lab testing mixing water with different chemicals. While working with chemical A he notes that the water becomes colder after combining them. With chemical B the water becomes much warmer. Given the changes in temperature, does chemical A cause an exothermic process or an endothermic process?
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Answer: exothermic

Joe lived in East Antarctica while his buddy Jim lived in West Antarctica. They were both into collecting rare specimens of plants and wildlife. They would often complain about the weather. Which friend lived at a lower elevation?
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Answer: Jim

David was studying human history. He selected two specific eras of human history, era A and era B. Era A was before humans had invented agriculture. And, era B was after the invention of agriculture. He noticed that human societies had changed dramatically after the invention of agriculture. Did era A have higher or lower death rate than era B?
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Answer:
lower