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Until the early _______ there were only negligible amounts of free oxygen in the atmosphere. A. Cenozoic B. Mesozoic C. Proterozoic D. Precambian

Until the early _______ there were only negligible amounts of free oxygen in the atmosphere. A. Cenozoic B. Mesozoic C. Proterozoic D. Precambian
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Until the early _______ there were only negligible amounts of free oxygen in the atmosphere.

A. Cenozoic
B. Mesozoic
C. Proterozoic
D. Precambian

User Himayan
by
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2 Answers

1 vote
C Proterozoic is the answer I just took the test hope this is very help 
User Brian Gesiak
by
7.6k points
4 votes
Just took the test it's D. proterozoic
User Andrii Shvydkyi
by
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