What do scientists use to answer scientific questions? A. A scientific guidebook
B. The scientific method
C. A scientific law
D. The atomic theory ​

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