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

Question I was asked: Earth is composed of layers of material with different properties. Which of the following is most likely to be in constant motion?


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

Question I was asked: How do most fish get the oxygen they need to survive?


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

Question I was asked:
Which two systems of the body are interacting when a runner sprains his ankle?