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Only 170 million years ago, new plankton evolved. Their demand for carbon and calcium permanently transformed the seas as homes for life...Complex organisms had been evolving since at least the beginning of the Cambrian period. “That’s, what, 300 million years of evolution in the Paleozoic? And all that time they were still so susceptible to these very basic geochemical shifts,” said Kilian Eichenseer, a doctoral candidate at the University of Plymouth.
