'Ecosystem engineers' responsible for first mass extinction

'Ecosystem engineers' responsible for first mass extinction Nashville (UPI) Jul 29, 2016 - Some 540 million years ago, the first animals disappeared. It's an event known as the end-Ediacaran extinction. New research suggests another group of early animals, known as Metazoans, were responsible. Ediacarans were the first successful group of multicellular organisms. Though largely immobile, the marine creatures thrived across much of the planet. They took on a variety of shapes ... more

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