Question

which were predictions based on the big bang theory? select all that apply. leftover radiation exists from the big bang low - mass stars become white dwarfs high - mass stars become neutron stars hydrogen and helium exist in abundance the universe is still expanding

Explanation:

The Big - Bang theory predicts the existence of cosmic microwave background radiation (leftover radiation from the Big Bang), the abundance of hydrogen and helium as the lightest elements formed in the early universe, and the expansion of the universe. The fate of stars (low - mass stars becoming white dwarfs and high - mass stars becoming neutron stars) is related to stellar evolution, not directly to the Big - Bang theory.

Answer:

leftover radiation exists from the big bang
hydrogen and helium exist in abundance
the universe is still expanding