Photosynthesis began 1.25 billion years ago on Earth: Study

The world’s oldest algae fossils are a billion years old, according to a study which found that the basis for photosynthesis in today’s plants was set in place 1.25 billion years ago
The study, published in the journal Geology, may resolve a long-standing mystery over the age of the fossilised algae, Bangiomorpha pubescens, which were first discovered in rocks in Arctic Canada in 1990. The microscopic organism is believed to be the oldest known direct ancestor of modern plants and animals, but it was poorly dated, with estimates placing it somewhere between 720 million and 1.2 billion years.



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