The Big Bang Theory explains which of the following?

• A. The universe expanded from an initial state of high density and temperature
• B. The origin of life on Earth
• C. The mechanism of genetic inheritance
• D. The behavior of subatomic particles in quantum fields

Answer: (A)

The idea being tested is that the Big Bang Theory describes the universe’s origin and expansion from a hot, dense early state. It says the universe began very compact and extremely hot, and space has been expanding ever since, cooling as it grows. This view is backed by key evidence: distant galaxies appear to be moving away from us (a redshift that shows expansion), the cosmic microwave background is the faint afterglow from the early hot universe, and the observed abundances of light elements like hydrogen and helium match predictions from early-universe nucleosynthesis. Those clues specifically describe the birth and evolution of the cosmos, not the origins of life, genetic inheritance, or how subatomic particles behave in quantum fields. The other topics belong to biology and quantum/particle physics, whereas the Big Bang Theory focuses on the history and structure of the universe itself.