Which of the following statements about the skeleton of a clam is NOT true?
A. The skeleton of a clam has two separate shells.
B. The skeleton of a clam has muscles attached to it from the inside of the body.
C. The skeleton of a clam is made of calcium carbonate.
D. The skeleton of a clam is used mainly to allow movement of the organism.
E. The skeleton of a clam grows with the organism.
Answer: D
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