An attempt at resolution
Letter to the Editor | Friday, December 1, 2006
I can’t believe I’m writing this letter. According to Webster’s dictionary:
animal: Function: noun 1 : any of a kingdom (Animalia) of living things including many-celled organisms and often many of the single-celled ones (as protozoans) that typically differ from plants in having cells without cellulose walls, in lacking chlorophyll and the capacity for photosynthesis, in requiring more complex food materials (as proteins), in being organized to a greater degree of complexity and in having the capacity for spontaneous movement and rapid motor responses to stimulation
human: Function: noun : a bipedal primate mammal
Humans are mammals, which are a class of vertebrates.
Vertebrates are a phylum of animals. A belongs to B, B belongs to C, C belongs to D, therefore A belongs to D.