By Will Dunham WASHINGTON (Reuters) - Scientists have spotted in rocks from northern China what may be the oldest fossils of a green plant ever found, tiny seaweed that carpeted areas of the seafloor roughly a billion years ago and were part of a primordial revolution among life on Earth. Researchers on Monday said the plant, called Proterocladus antiquus, was about the size of a rice grain and boasted numerous thin branches, thriving in shallow water while attached to the seafloor with a root-like structure. It may seem small, but Proterocladus - a form of green algae - was one of the largest organisms of its time, sharing the seas mainly with bacteria and other microbes.
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