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Zoology

  Zoology   ( / z oʊ ˈ ɒ l ə dʒ i / ) [note 1]   is the branch of   biology   that studies the   animal kingdom , including the   structure ,   embryology ,   classification ,   habits , and distribution of all animals, both living and   extinct , and how they interact with their   ecosystems . The term is derived from   Ancient Greek   ζῷον ,   zōion   ('animal'), and   λόγος ,   logos   ('knowledge', 'study'). [1] Although humans have always been interested in the natural history of the animals they saw around them, and used this knowledge to domesticate certain species, the formal study of zoology can be said to have originated with  Aristotle . He viewed animals as living organisms, studied their structure and development, and considered their adaptations to their surroundings and the function of their parts. The Greek physician  Galen  studied human anatomy and was one of the greatest surgeons of the ancient world, but after the fall of the  Western Roman E