Question

Which evidence proves the universe began with the big bang?.

Answer 1

Cosmic background radiation

Step-by-step explanation:

The best evidence for the Big Bang is the remnants of the light — called cosmic background radiation — released from the original explosion.

Answer 2

Answer: Cosmic Background radiation, expansion of the universe and the abundances of the lightest chemical elements

Step-by-step explanation:

• Cosmic Background radiation → this is the remnants of the radiation left over by the big bang.

• Expansion of the universe → due to both how uniform the temperature of the cosmic microwave background is and the universe's geometrical flatness, this suggests that the cosmos underwent inflation, soon after the big bang
• The abundances of the lightest elements → one website said, "the relative abundances of the lightest elements provide a strong test of the hypothesis that the universe was once far hotter and denser than it is now."

Hope this helps!