Difference between revisions of "Translations:AY Honors/Shells - Advanced/Answer Key/131/es"

Latest revision as of 21:10, 28 February 2021

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Message definition (AY Honors/Shells - Advanced/Answer Key)

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<gallery perrow=3 widths=200>
Image:Cypraea chinensis with partially extended mantle.jpg|The marine gastropod ''Cypraea chinensis'', the Chinese Cowry, showing partially extended mantle
Image:Giant_clam_or_Tridacna_gigas.jpg|The giant clam (''Tridacna gigas'') is the largest extant bivalve
Image:A fossil shell with calcite.jpg|Fossil shell covered in calcite crystals
</gallery>
In those molluscs which have a shell, the shell grows gradually over the lifetime of the mollusc by the addition of calcium carbonate to the leading edge or opening, and thus the shell gradually becomes longer and wider, in an increasing spiral shape, to better accommodate the growing animal inside. The animal also thickens the shell as it grows, so that the shell stays proportionately strong for its size.

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<!-- 6. Explain the development of a shell. How long do mollusks live? -->
<gallery perrow=3 widths=200>
Image:Cypraea chinensis with partially extended mantle.jpg|The marine gastropod ''Cypraea chinensis'', the Chinese Cowry, showing partially extended mantle
Image:Giant_clam_or_Tridacna_gigas.jpg|The giant clam (''Tridacna gigas'') is the largest extant bivalve
Image:A fossil shell with calcite.jpg|Fossil shell covered in calcite crystals
</gallery>
In those molluscs which have a shell, the shell grows gradually over the lifetime of the mollusc by the addition of calcium carbonate to the leading edge or opening, and thus the shell gradually becomes longer and wider, in an increasing spiral shape, to better accommodate the growing animal inside. The animal also thickens the shell as it grows, so that the shell stays proportionately strong for its size.