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OpenStudy (anonymous):
When did photosynthesis evolved?
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OpenStudy (anonymous):
There is strong evidence that photosynthetic organisms appeared around 3.2-3.5 billion years ago. However, there are other theories, and all are currently controversial. No one really knows.
OpenStudy (frostbite):
Agree with PlantMan, but we have a strong idea where to look, it is believed that ancestors to the photosynthetic filamentous cyanobacterium Anabaena might just lead back to the original chloroplast.
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