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OpenStudy (anonymous):
According to the fossil record, when did life first emerge on Earth? about 4.5 billion years ago about 4.0 billion years ago about 3.8 billion years ago about 2.0 billion years ago
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OpenStudy (praetorian.10):
3.5 Billion Years Ago
OpenStudy (praetorian.10):
so probably C
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