Which of the following would be an example of applied science? Investigating how carbon dioxide levels impact ocean pH

Investigating why water expands when it freezes

Investigating the conductivity of metalloids

Investigating how to develop a more efficient solar panel

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