he 10. The expansion of universe started off probably (a) 15 millions years ago (b) 20 million years ago (c) 15 billions years ago (d) 20 billions years ago
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Answer:
the correct option must be c) 15 billion years ago.
Explanation:
Scientists believe that the expansion of universe began 13.7 billion years ago (approximately), 15 billion years is the right answer.
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