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

Question I was asked: Which BEST explains why green marine algae are most often restricted to the top 100 meters of the ocean?

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

Question I was asked: In what way do transit systems, such as buses, benefit society?

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

Question I was asked:
Colored alcohol is used in some glass thermometers. When placed in air of different temperatures, the column of alcohol rises or falls in the glass thermometer. Which of the following best explains why the height of the alcohol column changes?