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Digiron [165]
3 years ago
11

About 1.2 billion years ago, eukaryotic and multicelled organisms evolved because _____. oxygen became available from cyanobacte

ria banded iron formations developed meteorite impacts increased the atmosphere got thicker from volcanic outgassing
Biology
1 answer:
Anna71 [15]3 years ago
3 0
Oxygen became available from cyanobacteria
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