Exoskeleton of a marine snail is composed of________________?
Correct answer: B. CaCO3
- A. CaPO4
- B. CaCO3
- C. CaSO4
- D. SiO2
Explanation
A marine snail's shell is mainly calcium carbonate, CaCO3, deposited by the mantle as the shell grows. Calcium phosphate is associated mainly with vertebrate bones, so students may select CaPO4 by confusing a shell with an internal bony skeleton.
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