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oyster pearl shellfish mollusk seafood ocean food animal nature wildlife underwater marine biology zoology anatomy physiology science education learning discovery exploration research investigation study analysis experiment observation conclusion hypothesis theory law principle fact information knowledge understanding wisdom intelligence reason logic thought mind brain consciousness self-awareness sentience life existence being reality universe cosmos nature world earth planet solar system galaxy universe space time matter energy force motion change growth development evolution adaptation survival extinction death end the oyster has a pearl inside there is a pearl inside the oyster the oyster has a pearl in it there is a pearl in the oyster