If you could dive down to the ocean floor nearly 540 million years ago just past the point where waves begin to break, you would find an explosion of life–scores of worm-like animals and other sea creatures tunneling complex holes and structures in the mud and sand–where before the environment had been mostly barren.
A fossilized meandering grazing trail from the Cambrian era
[Credit: Luis Buatois]Thanks to research published in…
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