A pearl oyster secrets pearls to [MP PMT 1997] – McqOptions

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1.	A pearl oyster secrets pearls to [MP PMT 1997]
A.	Regenerate injured parts
B.	Protect itself against invading parasite
C.	Harden its mantle cavity
D.	Isolate damaged tissues of the body
Answer» C. Harden its mantle cavity

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