Russian scientist says distant ancestor of humans had tentacles . They lived more than 540 million years ago and hunted them for food . It 's likely they also had a complex nervous system like we do today . yet another hypothesis that suggests 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 .