Comparing cooling temperature changes at different stages of the universe's life provides evidence of

Question

the rate of the universe's initial expansion, or the forces that produced the original singularity, or the radiation generated by the Big Bang expansion
Measuring the universe's ratio of hydrogen and helium provides evidence that these elements were
generated by the universe's ongoing expansion, or formed from the universe's original particles or formed long after the universe had cooled
pick one answer for each of the two sets of answer listed

Answer 1

For the first set of answers regarding cooling temperature changes at different stages of the universe's life, the most appropriate choice is: "the radiation generated by the Big Bang expansion."

For the second set of answers regarding the ratio of hydrogen and helium, the best choice is: "formed from the universe's original particles."

This supports the understanding that these elements were created during the early stages of the universe when it first cooled after the Big Bang, a process known as Big Bang nucleosynthesis.