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Gaviiformes
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Corticosteroid
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Papilio phorbanta
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Continental slope
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Epithelium
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Defecation
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Cubic system
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Ketohexose
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Ferralisation
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DOUBLE STAR
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West Nile Virus
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Phosphorescence
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Bose-Einstein Condensate
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Newtonian mechanics
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Courtship
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Organic agriculture
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Nernst theorem
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Pancreas
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VKA
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Sea-green
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Up quark
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Inertia
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Chimeric genome
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M92
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Omnivore
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Fluorescein
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Buccal enanthem
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Tetragonal system
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Aral sea
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Cave pearls
Shell
A shell is a hard, calcareous envelope that constitutes the external skeleton of most molluscs and brachiopods.
In birds: External calcified egg shell.
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