Nacre is a hard, iridescent, crystalline substance secreted by some animals in response to an irritant. Which of these precious substances contains nacre?

Nacre is a hard, iridescent, crystalline substance secreted by some an

1.	Nacre is a hard, iridescent, crystalline substance secreted by some animals in response to an irritant. Which of these precious substances contains nacre?
A.	Coral
B.	Amethyst
C.	Pearl
D.	Aquamarine
Answer» D. Aquamarine

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Nacre is a hard, iridescent, crystalline substance secreted by some animals in response to an irritant. Which of these precious substances contains nacre?

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