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Britannica Sources used in this answer

Which sea organisms can concentrate iodine?

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A labeled diagram highlights the periodic table entry for iodine, atomic number 53, symbol I, atomic weight 126.90447, and electron configuration. It shows iodine as a solid halogen with an orthorhombic crystal structure and strongly acidic higher-valence oxides, using color and shape keys for classification.
iodine

Certain sea organisms are known to concentrate iodine from their environment. Specifically, iodine is found in seaweeds, oysters, and the livers of cod.1