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Sea shells are largely composed of CaCO3 or Calcium Carbonate. This is also the main component of lime used to supply Calcium to soils which is readily leached from soils above 700mm annual rainfall. Calcium Carbonate is the main constituent in mollusc shells, mammalian hair and nails, exoskeleton of insects, bills and toenails of birds as it can be accumulated slowly in the body of an animal and used in animal parts that require hardness.

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10y ago

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