I just took a test in school today. What question was I asked?

Question I was asked: Which graph is best to present data collected on yearly water usage in the United States?

I just took a test in school today. What question was I asked?

Question I was asked: The liver converts glucose to glycogen for storage. Why is this function considered a chemical change?

I just took a test in school today. What question was I asked?

Question I was asked:
How has burning fossil fuels most caused a decline to the quality of air that people breathe?