When the Universe was very young,almost all matter consisted of the elements ______ and _________.
A) carbon; iron
B) uranium; lead
C) hydrogen,helium
D) oxygen,nitrogen

Question

Quizplus · Accepted Answer

According to current scientific understanding, when the Universe was very young, the only elements present in significant quantities were hydrogen and helium. This is due to the fact that these were the only elements that formed in large quantities during the Big Bang, which occurred shortly after the beginning of the Universe. Subsequent generations of stars were able to produce heavier elements through nuclear fusion, but in the early Universe, hydrogen and helium dominated.

When the Universe Was Very Young,almost All Matter Consisted of the Elements