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

Question I was asked: Which of the following is the best estimate of the number of stars in a typical galaxy?

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

Question I was asked: Salt concentration, water temperature, plankton, and the whale shark might all be used in a description of an ocean

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

Question I was asked:
Which would most likely be the characteristic of an object with a small volume and large mass?