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A pearl can be produced naturally by almost any shelled mollusk.
Question 1:
A pearl can be produced naturally by almost any shelled mollusk. What triggers the process of pearl formation?
A.
Irritant particles
B.
Changes in the chemical composition of the water.
C.
Pheromones
D.
All of these
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Trivial Practice Quiz science-technology - Test 118 | Englishfreetest.com
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15 questions
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