Meet Our Oldest Common Ancestor: A 555 Million-Year-Old Worm-Like Creature - EcoWatchwww.ecowatch.com/oldest-common-an...
Scientists have discovered our earliest common ancestor — and the earliest ancestor of all animal life. The honor goes to a worm-like creature that lived on the seafloor 555 million years ago. It's considered to be the first known bilaterian, an organism with a front and back, symmetrical sides and front and back openings with a gut in between.
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