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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Which one of the following molluscan groups is primarily used in pearl formation?

The composition of pearl is very much similar to that of

Which of the following is an incorrect pair?

Which of the following is an Indian species of pearl oyster?

$A$ pearl oyster secretes pearls to:

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