4 y1 u1 [0 j% D. N7 p: V! X7 Q Dogs have long been dependable companions by our sides. But it wasn’t always that way, and a look at their closest living relative, the wolf, makes it clear why. Research into dog domestication and intelligence offers clues into the human-dog relationship. And analyzing dogs’ brain activity and genes may even help answer whether dogs are in it for the food—or if they really love us. - ^* t2 t" e+ J: C ( R$ S( r9 _7 p4 @6 S& B3 b5 T $ x* z* r1 J; X2 a$ r* B( H) } 1 ] S8 u, ~1 T & f4 T, u1 M( L! i(, 下载次数: 6)
