A computed tomography (CT) scan fires radiation through the body to create an image. What type of radiation does a CT scan use? A. alpha radiation
B. beta radiation
C. gamma radiation
D. positron radiation

Which best describes the present-day universe? opaque, expanding very slowly, stars produce heavy elements transparent, expanding at an accelerated rate, stars produce heavy elements opaque, expanding at an accelerated rate, stars produce only hydrogen and helium transparent, expanding very slowly, stars produce only hydrogen and helium