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A dazzling assortment of life's variety of flavors burst into existence on Earth roughly 480 million years ago. There's long been speculation over what spurred this prolific radiation of new species, from
"It's really incredible to think how such small animals, ones that don't even exist today, could alter the course of evolutionary history in such a profound way,"in a specific sediment level across nine sites in Chesapeake Bay. Pyrite requires a steady supply of oxygen to form from sediment minerals, but it also easily reacts with oxygen, stealing it from the oceans and then the atmosphere.
The levels of pyrite seen in the sediment suggest something was churning the ocean floor in such a way that it was keeping this mineral from stealing back too much of the The researchers updated previous models of prehistoric oxygen levels with their measures of bioturbation.
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