Zoology () is the branch of biology that studies all the animals in 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".
Ancient history to Darwin
The history of zoology traces the study of the animal kingdom from ancient to modern times.
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