Fossils locked away for 1.75 billion years hold clues to a pivotal moment in Earth’s history

The earliest direct evidence of photosynthesis is found in fossils dating back 1.75 billion years.

The scientists collected fossils from Australia, Canada and the Democratic Republic of Congo and found that the samples from Australia and Canada contained evidence of cyanobacteria, the oldest known form of life on Earth. Scientists believe that cyanobacteria first appeared 2 to 3 billion years ago before they evolved to be able to produce oxygen, or generate oxygen, photosynthesis.

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