Can someone pls help me with this?

Explain why scientists use shared characteristics to make cladograms.

Convert .347 kilometers to miles show your work

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