Author Question: Which of the following are entirely, or partly, composed of calcium carbonate? A (Read 1450 times)

Charlie

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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



camila

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Answer has to be B, trust me!



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Charlie

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Wonderful, you were right, thank you so much.




 

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