Proterozoic Eon

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1.
proterozoic
2.
oxidation
3.
atmosphere
4.
volcanic
5.
cyanobacteria
6.
photosynthesis
7.
nitrogen
8.
organism
9.
climate
10.
oceans
11.
sulfates
12.
cambrian
13.
diversity
14.
weathering
15.
crucial
16.
geology
17.
reveal
18.
origin
19.
complex
20.
surface
21.
growth