May 13 2013, 7:21 PM
Going back to that quote, nothing did "just come around". As orimac said, very, very, gradual changes happened over time. Changes so small you wouldn't notice them unless they were played in fast forward, on a high setting.
This isn't biological evolution, but it might be easier for people to grasp:
Saying that the human body just came around is like saying the modern F1 car just came around (and to honest, it sounds like creationism). Instead, very basic cars long ago were gradually improved. The ones that did better inspired copy cats or similar designs (survive, reproduce). The ones that did worse didn't win and people stopped using them (die off). If you go from one year to another, the cars look basically the same in most cases. But if you skip decades, or go from beginning to end, they look completely different.