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Biology, 12.11.2019 18:31 kutubmia

What did not occur in the proterozoic eon?
a. the oxygen level increased greatly in the atmosphere
b. the emergence of eukarya
c. multi-celled eukaryotic organism began to diversify
d. anaerobic bacteria kept thriving with more oxygen

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What did not occur in the proterozoic eon?
a. the oxygen level increased greatly in the atmos...

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