The two correct items that provide evidence supporting the Big Bang theory are:
- Cosmic background radiation - This is the afterglow radiation from the Big Bang and is a key piece of evidence for the theory.
- Composition of matter in the universe - The proportions of light elements (hydrogen, helium, and lithium) produced during Big Bang nucleosynthesis support the predictions made by the Big Bang theory.
So the answers are:
- Cosmic background radiation
- Composition of matter in the universe.