Similarities between the jaw of a carnivore and that of a herbivore

Carnivores, like herbivores have a front row of incisor teeth that are generally used for nibbling. ... The only difference is that the upper jaw of the bear aligns closer to the bottom jaw, giving more of a chewing mechanism than the dog, despite showing similar multi-cusped polar and molar teeth

dang you just copied and pasted

explanation:

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".