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Hoochie [10]
4 years ago
7

Until the early _______ there were only negligible amounts of free oxygen in the atmosphere.

Biology
2 answers:
ra1l [238]4 years ago
7 0
C Proterozoic is the answer I just took the test hope this is very help 
DerKrebs [107]4 years ago
5 0
Just took the test it's D. proterozoic
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