It is the number, kind , and arrange of teeth that determine whether a mammal is classified as a carnivore not the food that the animal acctually eats.

这个里面arrange应该改成arrangement...但是后边的句子有点不明白:is classified as a carnivore not the food ... 这里是不是省略用法啊,完整的是whether a mammal is classified as a carnivore and not the food that....,然后and就省略掉了,这样子可以么?谢谢大家...