It turns out the earliest known ancestor of humans was a sea creature a millimeter in size that likely lacked an anus. "All deuterostomes had a common ancestor, and we think that is what we are looking at here," researcher Simon Conway Morris tells the BBC. As for what they're looking at, "the bag-like body bears a prominent mouth and associated folds," the researchers write. That left scientists stumped as to what a common ancestor would have looked like. This article originally appeared on Newser: This Thing Is Your Ancestor

Source: Fox News January 31, 2017 21:00 UTC