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

Question I was asked: Scientists can identify an element by looking at the structure of a single

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

Question I was asked: Pepsin is an enzyme that acts in the stomach for protein digestion. Which of these is most likely the main role of pepsin in this metabolic reaction?

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

Question I was asked:
More sulfur dioxide is being added to the atmosphere. How will this most likely affect the hydrosphere?