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About 1.2 billion years ago, eukaryotic and multicelled organisms evolved because _____.

oxygen became available from cyanobacteria

banded iron formations developed

meteorite impacts increased

the atmosphere got thicker from volcanic outgassing

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The correct answer for the question that is being presented above is this one: "oxygen became available from cyanobacteria." About 1.2 billion years ago, eukaryotic and multicelled organisms evolved because oxygen became available from cyanobacteria.
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