The theory says that the big bang produced the chemical elements hydrogen and helium. What evidence supports this? You find an abundance of both hydrogen and helium in all matter.
A. You find an abundance of both hydrogen and helium in all matter.
B. The composition of stars is mostly hydrogen.
C. Astronomers found primordial gases with the expected ratio of helium to hydrogen.
D. Primordial hydrogen gas was found and there is an abundance of both of these elements.
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