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Until the early there were only neglible amounts of free oxygen in the atmosphere. A: Mesozic B Cenozoic C Proterozoic D Precambian
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Until the early there were only neglible amounts of free oxygen in the atmosphere.

A: Mesozic
B Cenozoic
C Proterozoic
D Precambian

User Jayeshkumar Sojitra
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1 Answer

2 votes

C

Quite sure it is C

User Mdandr
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