abby6ngtania abby6ngtania

23-04-2016
Biology

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Oxygen levels first rose in the atmosphere because of _____.

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Anonymous Anonymous

23-04-2016

cyanobacteria due to their use of photosynthesis.

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penfila11Pen penfila11Pen

23-04-2016

Cyanobacteria.
These bacterias gain their energy through photosynthesis.

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