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Zoology ( / z oʊ ˈ ɒ l ə dʒ i , z u -/ ) [note 1] is the branch of biology that studies the animal kingdom, including the structure , embryology , evolution , 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 , i.e. " animal " and λόγος, logos , i.e. "knowledge, study".