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

Question I was asked: Which best determines the health of a lake used as a source of freshwater?


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

Question I was asked: Which of the following is a by-product of cellular respiration in animals?


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

Question I was asked:
What unit do scientists use to measure the distance between stars?