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Those were the First signs of primeval life (bacteria and blue-green algae) appear in oceans.

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Q: What happened in 3 billion bc?
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What happened 3 billion B.C?

stuff


What has happened to the 3 billion pounds that has gone missing from Scotland?

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Why doesn't BC mean billion centuries?

As a formal acronym, it just doesn't. BC is commonly used as meaning Before Christ. BC could of course stand for billion centuries, but there is no common usage of that term.


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