Two observations that led scientists to conclude that the Big Bang occurred approximately 14 billion years ago are
a. _____ a steady-state universe and background radiation of 2.7 K above absolute zero; b. _____ a steady-state universe and opaque background radiation; c. _____ an expanding universe and opaque background radiation; d. _____ an expanding universe and background radiation of 2.7 K above absolute zero; e. _____ a shrinking universe and opaque background radiation.
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