Which of the following are entirely, or partly, composed of calcium carbonate?
A) spicules of siliceous sponges
B) coral animals' exoskeletons
C) molluscs' mantles
D) insects' cuticles
E) nematodes' cuticles
Answer: B
Which of the following are entirely, or partly, composed of calcium carbonate?
A) spicules of siliceous sponges
B) coral animals' exoskeletons
C) molluscs' mantles
D) insects' cuticles
E) nematodes' cuticles
Answer: B
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