In a single sentence, parallel to Aristotle's statement asserting that being is substance, St. Thomas pushes away from the Aristotelian doctrine: "Being is not a genus, since it is not predicated univocally but only analogically." His term for analogy is Latin "analogia". In the categorical classification of all beings, all substances are partly the same: man and chimpanzee are both animals and the animal part in man is "the same" as the animal part in chimpanzee. Most fundamentally all substances are matter, a theme taken up by science, which postulated one or more matters, such as earth, air, fire or water (Empedocles). In today's chemistry the carbon, hydrogen, oxygen and nitrogen in a chimpanzee are identical to the same elements in a man.