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The top documents tagged [system of air sacs]
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Teeth Tongue Salivary Glands Pharynx Epiglottis Uvula
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Birds Ch. 12.1. One day in 1861, in a limestone quarry in what is now Germany, Hermann von Meyer was inspecting rocks. He was a fossil hunter, spotted
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CLASS AVES. Class Aves Most paleontologists agree that the common ancestor of all existing birds was a type of small, feathered dinosaur. Recent fossil
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