Origin of photosynthesis may go further back than estimates from 50 years ago

Excerpt from the March 18, 1967, issue of Science News

cyanobacteria

SOLAR POWERED  Ancient cyanobacteria, much like these modern-day ones, expelled oxygen into Earth’s atmosphere as a byproduct of photosynthesis, perhaps as early as 3.2 billion years ago.

Nnehring/iStockphoto

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