When a screen is used to easily separate substances, what physical properties are being used?

What effect does nuclear radiation have on atoms?

Match each statement with the state of matter it describes

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