Which of the following statements about skeletons is NOT true?
A. All exoskeletons must be shed as the animal grows.
B. An earthworm has a fluid-filled cavity that acts as a hydrostatic skeleton.
C. The skeleton of a clam is an exoskeleton.
D. The skeleton of an arthropod is an exoskeleton.
E. The skeleton of a vertebrate is an endoskeleton.
Answer: A
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