A pearl oyster secretes pearls to ...................
A
Regenerate injured parts
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B
Protect itself against invading parasite
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C
Harden its mantle cavity
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D
Isolate damaged tissues of the body
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Solution
The correct option is B Protect itself against invading parasite The pearl is secreted by nacreous layer of pearl oyster as a protection against foreign body such as parasite or a sand particle.