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Maybe one of the evolutionary purposes of shell formation is eliminating calcium as an impurity?
Magnesium is an essential element in biological systems. Magnesium occurs typically as the Mg2+ ion. It is an essential mineral nutrient for life[1][2][3] and is present in every cell type in every organism.

Those whom the Gods wish to destroy They first make mad. -- Euripides
by Migeru (migeru at eurotrib dot com) on Fri Oct 6th, 2006 at 11:53:54 AM EST
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