资讯

Why do humans have canine teeth? Patrick McGannon ... says Richard Potts, director of the Human Origins Program at the Museum of Natural History. Neanderthal DNA makes up a small percentage ...
Narrator: Lions have them, hippos have them, and even you and I have them: canines, those long, pointy front teeth. They're actually the longest teeth in the human mouth. So what are these long ...
just like human babies! A puppy should have 14 teeth on top and 14 on bottom. This includes 12 incisors, 4 canine teeth, and ...