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Description

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File:The chain of life in geological time (microform) - a sketch of the origin and succession of animals and plants (1880) (20612252475).jpg - Wikimedia Commons

Public and Private Life of Animals (1877) — The Public Domain Review

Animal - Wikipedia

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The Illustrated Encyclopedia of Animal Life, Vol. 1: Mammals * OF THE NEW ILLUSTRATED ANIMAL KINGDOM 1961: Drimmer, Frederick: : Books

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Paleontology

The study of animal life - Biodiversity Heritage Library

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Animal - Wikipedia

When did animal life begin on Earth? Oxford study brings us step closer to answer - Study Finds