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Evidence of an oxygen-rich atmosphere is the presence of A cyanobacteria B. trace fossils C. banded iron formations D. stromatolites
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Evidence of an oxygen-rich atmosphere is the presence of

A cyanobacteria
B. trace fossils
C. banded iron formations
D. stromatolites

User Zenith
by
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2 Answers

2 votes
I Believe it to be Stromatolites
User Sebastian Inones
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7.0k points
1 vote
Stromatolites is the answer
User Ealhad
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7.1k points
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