Russian scientist says distant ancestor of humans had tentacles . They lived more than 540 million today and used them for food . It 's likely they also had a complex nervous system like we do years ago . Challenges another theory that says our ancestors were more worm-like .
Russian scientist says distant ancestor of humans had tentacles . They lived more than 540 million years ago and used them for food . It 's likely they also had a complex nervous system like we do today . Challenges another theory that says our ancestors were more worm-like .