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The primary cause of a pearl forming is __________. A. A larva that is not released after fertilization of the egg B. Pollutants present in the water C. The presences of a nacreous layer in oysters D.
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The primary cause of a pearl forming is __________.

A. A larva that is not released after fertilization of the egg
B. Pollutants present in the water
C. The presences of a nacreous layer in oysters
D. An irritant that becomes embedded in the mantle

User Prencher
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The answer is D. An irritant that because embedded in the mantle
User Anoel
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