Sentence:  An elephant or a fox or a swan or a cocopalm or a banana possess in unusually high degree this quality of obvious , common-sense , indubitable identity , as do an eye or <WSD>tooth</WSD> or nail . 
Meaning of the word marked with <WSD> tags:  hard bonelike structures in the jaws of vertebrates; used for biting and chewing or for attack and defense