Shells of molluscs are used for preparing ointments because they are rich in

  • A
    Zinc
  • B
    Iodine
  • C
    Sodium
  • D
    $A$ and $B$ both

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Precious pearls are obtained from which of the following animals?

Natural pearl is formed by

$A$ pearl oyster secretes pearls to:

The production of pearls artificially is known as

Pearl is secreted around the

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