GUSTOIMAGES / SCIENCE PHOTO LIBRARY GUSTOIMAGES / SCIENCE PHOTO LIBRARY
Sea shell, X-ray. This sea shell is from a marine gastropod mollusc (sea snail), with the mollusc living in the space inside the shell. The shell mainly comprises calcium carbonate, which is embedded on an organic scaffold. This shell is formed from secretions produced by the mollusc, and grows in size over time, following a spiral pattern. The X-ray shows internal details of this pattern.
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