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

Question I was asked: A student proposes the rate of increase in a plant's mass will be proportional to the length of light exposure per day when all other variables are constant. How should this proposal be classified?

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

Question I was asked: Which of these can be mined from Earth and used as an energy source?

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

Question I was asked:
In 2004 the Hubble space telescope captured images of distant star clusters, each containing about a million stars. These star clusters were most likely part of which structure?