Which of the following is true of dolomite, calcite and silica?
A) Dolomite is not secreted by invertebrate animals for shells.
B) It is not different in any way from calcite, but its molecules are arranged more tightly than silica's.
C) It is not different in any way from silica, but its molecules are arranged more tightly than calcite's.
D) They are all the same.
Answer: A
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