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Biology 14 Online
OpenStudy (anonymous):

when did photosynthesis first occur

OpenStudy (anonymous):

The first photosynthetic organisms evolved about 3,500 million years ago.

OpenStudy (anonymous):

i think these organisms where Cyanobacteria

OpenStudy (anonymous):

Cyanobacteria were present on earth as early as 2.7 billion years ago.

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