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

Question I was asked: The Milky Way Galaxy is visible as a bright region in the night sky. Modern telescopic observation has made it possible to discover that the brightness of the Milky Way Galaxy is due primarily to which structure?

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

Question I was asked: Why should scientists wear goggles during experiments?

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

Question I was asked:
What safety rule is most important for students to follow when working with acids and bases?