What is the origin of the shell of the molluscan clam?
A) Clam shell is a form of skeletal bone tissue
B) Calcium carbonate is crystallized out of the salts in the surrounding water by astrocytes on the surface of the epidermis
C) Heavy layers of chitin are secreted by the molluscan epidermis
D) Mucous glands in the molluscan epidermis secrete the calcium carbonate of the shell
E) Mucous glands in the molluscan epidermis secrete a chitin that is then stiffened by calcification
Correct Answer:
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B)
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