lauramarie1186 lauramarie1186

23-10-2016
Biology

contestada

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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mudameya mudameya

27-09-2017

Just took the test it's D. proterozoic

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brownchina7 brownchina7

27-09-2017

C Proterozoic is the answer I just took the test hope this is very help

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