(A) 10-20 (✔)
(B) 20-30 (X)
(C) 30-40 (X)
(D) 40-50 (X)
Answer: According to Big Bang Theory, the Universe began about 10-20 billion years ago.
(A) 10-20 (✔)
(B) 20-30 (X)
(C) 30-40 (X)
(D) 40-50 (X)
Answer: According to Big Bang Theory, the Universe began about 10-20 billion years ago.
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