Comparing cooling temperature changes at different stages of the universe's life provides evidence of ______. Measuring the universe's ratio of hydrogen and helium provides evidence that these elements were______

Answer 1

Comparing cooling temperature changes at different stages of the universe's life provides evidence of the expansion and cooling of the universe over time. As the universe expands, the temperature tends to decrease.

Measuring the universe's ratio of hydrogen and helium provides evidence that these elements were formed during the early stages of the universe, specifically during the Big Bang nucleosynthesis. The abundance of hydrogen and helium in the universe is a direct result of the conditions and processes that occurred shortly after the Big Bang.